feat: add load-watcher project with initial implementation and CI configuration

Signed-off-by: zhenyus <zhenyus@mathmast.com>
2025-03-19 15:59:37 +08:00 · 2025-03-19 15:59:37 +08:00 · 4f795e19d7
commit 4f795e19d7
parent 875b072c51
26 changed files with 3007 additions and 0 deletions
--- a/3rd/load-watcher/.github/workflows/ci.yml
+++ b/3rd/load-watcher/.github/workflows/ci.yml
@ -0,0 +1,25 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.22
+
+    - name: Build
+      run: go build -o load-watcher main.go
+
+    - name: Test
+      run: go test ./...
--- a/3rd/load-watcher/.gitignore
+++ b/3rd/load-watcher/.gitignore
@ -0,0 +1 @@
+.idea/
--- a/3rd/load-watcher/.grenrc
+++ b/3rd/load-watcher/.grenrc
@ -0,0 +1,10 @@
+{
+    "dataSource": "milestones",
+    "groupBy": {
+        "Features:": ["enhancement", "documentation"],
+        "Bug Fixes:": ["bug"]
+    },
+    "ignoreLabels": ["help wanted", "question", "good first issue"],
+    "milestoneMatch": "{{tag_name}}",
+    "changelogFilename": "CHANGELOG.md"
+}
--- a/3rd/load-watcher/CHANGELOG.md
+++ b/3rd/load-watcher/CHANGELOG.md
@ -0,0 +1,23 @@
+# Changelog
+
+## v0.1.1 (26/02/2021)
+
+#### Bug Fixes:
+
+- [**bug**] Cannot use the LibraryClient with the watcher [#18](https://github.com/paypal/load-watcher/issues/18)
+
+---
+
+## v0.1.0 (24/02/2021)
+
+#### Enhancements:
+
+- [**enhancement**] Maintaining consistent release version [#17](https://github.com/paypal/load-watcher/issues/17)
+- [**enhancement**] Move metricsprovider to internal [#15](https://github.com/paypal/load-watcher/issues/15)
+- [**enhancement**] Need lib to run `load-watcher` client [#12](https://github.com/paypal/load-watcher/issues/12)
+- [**enhancement**] Prometheus Client is Missing [#10](https://github.com/paypal/load-watcher/issues/10)
+- [**documentation**][**enhancement**] Dockerfile and k8s deployment tutorial are needed [#5](https://github.com/paypal/load-watcher/issues/5)
+
+#### Bug Fixes:
+
+- [**bug**] Is there some errors? [#7](https://github.com/paypal/load-watcher/issues/7)
--- a/3rd/load-watcher/CODEOWNERS
+++ b/3rd/load-watcher/CODEOWNERS
@ -0,0 +1 @@
+*       @lenhattan86 @wangchen615
--- a/3rd/load-watcher/Dockerfile
+++ b/3rd/load-watcher/Dockerfile
@ -0,0 +1,10 @@
+FROM golang:1.23
+WORKDIR /go/src/github.com/paypal/load-watcher
+COPY . .
+RUN make build
+
+FROM alpine:3.12
+
+COPY --from=0 /go/src/github.com/paypal/load-watcher/bin/load-watcher /bin/load-watcher
+
+CMD ["/bin/load-watcher"]
--- a/3rd/load-watcher/LICENSE
+++ b/3rd/load-watcher/LICENSE
@ -0,0 +1,15 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
--- a/3rd/load-watcher/Makefile
+++ b/3rd/load-watcher/Makefile
@ -0,0 +1,28 @@
+# Copyright 2021 PayPal
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+COMMONENVVAR=GOOS=$(shell uname -s | tr A-Z a-z) GOARCH=$(subst x86_64,amd64,$(patsubst i%86,386,$(shell uname -m)))
+BUILDENVVAR=CGO_ENABLED=0
+
+.PHONY: all
+all: build
+	chmod +x bin/load-watcher
+
+.PHONY: build
+build:
+	$(COMMONENVVAR) $(BUILDENVVAR) go build -o bin/load-watcher main.go
+
+.PHONY: clean
+clean:
+	rm -rf ./bin
--- a/3rd/load-watcher/README.md
+++ b/3rd/load-watcher/README.md
@ -0,0 +1,54 @@
+# Load Watcher [![Go Reference](https://pkg.go.dev/badge/github.com/paypal/load-watcher.svg)](https://pkg.go.dev/github.com/paypal/load-watcher) ![CI Build Status](https://github.com/paypal/load-watcher/actions/workflows/ci.yml/badge.svg) [![Automated Release Notes by gren](https://img.shields.io/badge/%F0%9F%A4%96-release%20notes-00B2EE.svg)](https://github-tools.github.io/github-release-notes/)
+
+The load watcher is responsible for the cluster-wide aggregation of resource usage metrics like CPU, memory, network, and IO stats over time windows from a metrics provider like SignalFx, Prometheus, Kubernetes Metrics Server etc. developed for [Trimaran: Real Load Aware Scheduling](https://github.com/kubernetes-sigs/scheduler-plugins/blob/master/kep/61-Trimaran-real-load-aware-scheduling/README.md) in Kubernetes.
+It stores the metrics in its local cache, which can be queried from scheduler plugins.
+
+The following metrics provider clients are currently supported:
+
+1) SignalFx
+2) Kubernetes Metrics Server
+3) Prometheus
+
+These clients fetch CPU usage currently, support for other resources will be added later as needed.
+
+# Tutorial
+
+This tutorial will guide you to build load watcher Docker image, which can be deployed to work with Trimaran scheduler plugins.
+
+The default `main.go` is configured to watch Kubernetes Metrics Server.
+You can change this to any available metrics provider in `pkg/metricsprovider`.
+To build a client for new metrics provider, you will need to implement `FetcherClient` interface.
+
+From the root folder, run the following commands to build docker image of load watcher, tag it and push to your docker repository:
+
+```
+docker build -t load-watcher:<version> .
+docker tag load-watcher:<version> <your-docker-repo>:<version>
+docker push <your-docker-repo>
+```
+
+Note that load watcher runs on default port 2020. Once deployed, you can use the following API to read watcher metrics:
+
+```
+GET /watcher
+```
+
+This will return metrics for all nodes. A query parameter to filter by host can be added with `host`.
+
+## Metrics Provider Configuration
+- By default Kubernetes Metrics Server client is configured. Set `KUBE_CONFIG` env var to your kubernetes client configuration file path if running out of cluster.
+
+- To use the Prometheus client, please configure environment variables `METRICS_PROVIDER_NAME`, `METRICS_PROVIDER_ADDRESS` and `METRICS_PROVIDER_TOKEN` to `Prometheus`, Prometheus address and auth token. Please do not set `METRICS_PROVIDER_TOKEN` if no authentication 
+  is needed to access the Prometheus APIs. Default value of address set is `http://prometheus-k8s:9090` for Prometheus client.
+
+- To use the SignalFx client, please configure environment variables `METRICS_PROVIDER_NAME`, `METRICS_PROVIDER_ADDRESS` and `METRICS_PROVIDER_TOKEN` to `SignalFx`, SignalFx address and auth token respectively. Default value of address set is `https://api.signalfx.com` for SignalFx client.
+  
+## Deploy `load-watcher` as a service
+To deploy `load-watcher` as a monitoring service in your Kubernetes cluster, you should replace the values in the `[]` with your own cluster monitoring stack and then you can run the following.
+```bash
+> kubectl create -f manifests/load-watcher-deployment.yaml
+```
+
+## Using `load-watcher` client
+- `load-watcher-client.go` shows an example to use `load-watcher` packages as libraries in a client mode. When `load-watcher` is running as a
+service exposing an endpoint in a cluster, a client, such as Trimaran plugins, can use its libraries to create a client getting the latest metrics.
--- a/3rd/load-watcher/go.mod
+++ b/3rd/load-watcher/go.mod
@ -0,0 +1,64 @@
+module github.com/paypal/load-watcher
+
+go 1.22.0
+
+require (
+	github.com/francoispqt/gojay v1.2.13
+	github.com/prometheus/client_golang v1.19.1
+	github.com/prometheus/common v0.55.0
+	github.com/sirupsen/logrus v1.6.0
+	github.com/stretchr/testify v1.9.0
+	k8s.io/apimachinery v0.31.2
+	k8s.io/client-go v0.31.2
+	k8s.io/klog/v2 v2.130.1
+	k8s.io/metrics v0.31.2
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.7.0 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-openapi/jsonpointer v0.19.6 // indirect
+	github.com/go-openapi/jsonreference v0.20.2 // indirect
+	github.com/go-openapi/swag v0.22.4 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/gnostic-models v0.6.8 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/gofuzz v1.2.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/imdario/mergo v0.3.6 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/jpillora/backoff v1.0.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/oauth2 v0.21.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
+	golang.org/x/term v0.21.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/api v0.31.2 // indirect
+	k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 // indirect
+	k8s.io/utils v0.0.0-20240711033017-18e509b52bc8 // indirect
+	sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.4.1 // indirect
+	sigs.k8s.io/yaml v1.4.0 // indirect
+)
--- a/3rd/load-watcher/go.sum
+++ b/3rd/load-watcher/go.sum
@ -0,0 +1,328 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo=
+dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU=
+dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
+dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
+dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
+git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
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+k8s.io/apimachinery v0.31.2 h1:i4vUt2hPK56W6mlT7Ry+AO8eEsyxMD1U44NR22CLTYw=
+k8s.io/apimachinery v0.31.2/go.mod h1:rsPdaZJfTfLsNJSQzNHQvYoTmxhoOEofxtOsF3rtsMo=
+k8s.io/client-go v0.31.2 h1:Y2F4dxU5d3AQj+ybwSMqQnpZH9F30//1ObxOKlTI9yc=
+k8s.io/client-go v0.31.2/go.mod h1:NPa74jSVR/+eez2dFsEIHNa+3o09vtNaWwWwb1qSxSs=
+k8s.io/klog/v2 v2.130.1 h1:n9Xl7H1Xvksem4KFG4PYbdQCQxqc/tTUyrgXaOhHSzk=
+k8s.io/klog/v2 v2.130.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
+k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340 h1:BZqlfIlq5YbRMFko6/PM7FjZpUb45WallggurYhKGag=
+k8s.io/kube-openapi v0.0.0-20240228011516-70dd3763d340/go.mod h1:yD4MZYeKMBwQKVht279WycxKyM84kkAx2DPrTXaeb98=
+k8s.io/metrics v0.31.2 h1:sQhujR9m3HN/Nu/0fTfTscjnswQl0qkQAodEdGBS0N4=
+k8s.io/metrics v0.31.2/go.mod h1:QqqyReApEWO1UEgXOSXiHCQod6yTxYctbAAQBWZkboU=
+k8s.io/utils v0.0.0-20240711033017-18e509b52bc8 h1:pUdcCO1Lk/tbT5ztQWOBi5HBgbBP1J8+AsQnQCKsi8A=
+k8s.io/utils v0.0.0-20240711033017-18e509b52bc8/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
+sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd h1:EDPBXCAspyGV4jQlpZSudPeMmr1bNJefnuqLsRAsHZo=
+sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd/go.mod h1:B8JuhiUyNFVKdsE8h686QcCxMaH6HrOAZj4vswFpcB0=
+sigs.k8s.io/structured-merge-diff/v4 v4.4.1 h1:150L+0vs/8DA78h1u02ooW1/fFq/Lwr+sGiqlzvrtq4=
+sigs.k8s.io/structured-merge-diff/v4 v4.4.1/go.mod h1:N8hJocpFajUSSeSJ9bOZ77VzejKZaXsTtZo4/u7Io08=
+sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E=
+sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY=
+sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
+sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=
--- a/3rd/load-watcher/main.go
+++ b/3rd/load-watcher/main.go
@ -0,0 +1,51 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"github.com/paypal/load-watcher/pkg/watcher"
+	"github.com/paypal/load-watcher/pkg/watcher/api"
+	log "github.com/sirupsen/logrus"
+	"os"
+)
+
+func init() {
+	log.SetReportCaller(true)
+	logLevel, evnLogLevelSet := os.LookupEnv("LOG_LEVEL")
+	parsedLogLevel, err := log.ParseLevel(logLevel)
+	if evnLogLevelSet && err != nil {
+		log.Infof("unable to parse log level set; defaulting to: %v", log.GetLevel())
+	}
+	if err == nil {
+		log.SetLevel(parsedLogLevel)
+	}
+}
+
+func main() {
+	client, err := api.NewLibraryClient(watcher.EnvMetricProviderOpts)
+	if err != nil {
+		log.Fatalf("unable to create client: %v", err)
+	}
+	metrics, err := client.GetLatestWatcherMetrics()
+	if err != nil {
+		log.Errorf("unable to get watcher metrics: %v", err)
+	}
+	log.Debugf("received metrics: %v", metrics)
+
+	// Keep the watcher server up
+	select {}
+}
--- a/3rd/load-watcher/manifests/load-watcher-deployment.yaml
+++ b/3rd/load-watcher/manifests/load-watcher-deployment.yaml
@ -0,0 +1,51 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: loadwatcher
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: load-watcher-deployment
+  namespace: loadwatcher
+  labels:
+    app: load-watcher
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: load-watcher
+  template:
+    metadata:
+      labels:
+        app: load-watcher
+    spec:
+      containers:
+      - name: load-watcher
+        image: [load-watcher image]
+        env:
+        - name: METRICS_PROVIDER_NAME
+          value: [Prometheus/SignalFx]
+        - name: METRICS_PROVIDER_ADDRESS
+          value: [metrics_provider_endpoint]
+        - name: METRICS_PROVIDER_TOKEN
+          value: [token]
+        ports:
+        - containerPort: 2020
+---
+apiVersion: v1
+kind: Service
+metadata:
+  namespace: loadwatcher
+  name: load-watcher
+  labels:
+    app: load-watcher
+spec:
+  type: ClusterIP
+  ports:
+  - name: http
+    port: 2020
+    targetPort: 2020
+    protocol: TCP
+  selector:
+    app: load-watcher
--- a/3rd/load-watcher/pkg/watcher/api/api.go
+++ b/3rd/load-watcher/pkg/watcher/api/api.go
@ -0,0 +1,25 @@
+/*
+Copyright 2021 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package api
+
+import "github.com/paypal/load-watcher/pkg/watcher"
+
+// Watcher Client API
+type Client interface {
+	// Returns latest metrics present in load Watcher cache
+	GetLatestWatcherMetrics() (*watcher.WatcherMetrics, error)
+}
--- a/3rd/load-watcher/pkg/watcher/api/client.go
+++ b/3rd/load-watcher/pkg/watcher/api/client.go
@ -0,0 +1,113 @@
+/*
+Copyright 2021 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package api
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/francoispqt/gojay"
+	"github.com/paypal/load-watcher/pkg/watcher"
+	"github.com/paypal/load-watcher/pkg/watcher/internal/metricsprovider"
+
+	"k8s.io/klog/v2"
+)
+
+const (
+	httpClientTimeoutSeconds = 55 * time.Second
+)
+
+// Client for Watcher APIs as a library
+type libraryClient struct {
+	fetcherClient watcher.MetricsProviderClient
+	watcher       *watcher.Watcher
+}
+
+// Client for Watcher APIs as a service
+type serviceClient struct {
+	httpClient     http.Client
+	watcherAddress string
+}
+
+// Creates a new watcher client when using watcher as a library
+func NewLibraryClient(opts watcher.MetricsProviderOpts) (Client, error) {
+	var err error
+	client := libraryClient{}
+	switch opts.Name {
+	case watcher.PromClientName:
+		client.fetcherClient, err = metricsprovider.NewPromClient(opts)
+	case watcher.SignalFxClientName:
+		client.fetcherClient, err = metricsprovider.NewSignalFxClient(opts)
+	default:
+		client.fetcherClient, err = metricsprovider.NewMetricsServerClient()
+	}
+	if err != nil {
+		return client, err
+	}
+	client.watcher = watcher.NewWatcher(client.fetcherClient)
+	client.watcher.StartWatching()
+	return client, nil
+}
+
+// Creates a new watcher client when using watcher as a service
+func NewServiceClient(watcherAddress string) (Client, error) {
+	return serviceClient{
+		httpClient: http.Client{
+			Timeout: httpClientTimeoutSeconds,
+		},
+		watcherAddress: watcherAddress,
+	}, nil
+}
+
+func (c libraryClient) GetLatestWatcherMetrics() (*watcher.WatcherMetrics, error) {
+	return c.watcher.GetLatestWatcherMetrics(watcher.FifteenMinutes)
+}
+
+func (c serviceClient) GetLatestWatcherMetrics() (*watcher.WatcherMetrics, error) {
+	req, err := http.NewRequest(http.MethodGet, c.watcherAddress+watcher.BaseUrl, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	//TODO(aqadeer): Add a couple of retries for transient errors
+	resp, err := c.httpClient.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	klog.V(6).Infof("received status code %v from watcher", resp.StatusCode)
+	if resp.StatusCode == http.StatusOK {
+		data := watcher.Data{NodeMetricsMap: make(map[string]watcher.NodeMetrics)}
+		metrics := watcher.WatcherMetrics{Data: data}
+		dec := gojay.BorrowDecoder(resp.Body)
+		defer dec.Release()
+		err = dec.Decode(&metrics)
+		if err != nil {
+			klog.Errorf("unable to decode watcher metrics: %v", err)
+			return nil, err
+		} else {
+			return &metrics, nil
+		}
+	} else {
+		err = fmt.Errorf("received status code %v from watcher", resp.StatusCode)
+		klog.Error(err)
+		return nil, err
+	}
+	return nil, nil
+}
--- a/3rd/load-watcher/pkg/watcher/internal/metricsprovider/k8s.go
+++ b/3rd/load-watcher/pkg/watcher/internal/metricsprovider/k8s.go
@ -0,0 +1,166 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package metricsprovider
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+
+	"github.com/paypal/load-watcher/pkg/watcher"
+	log "github.com/sirupsen/logrus"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+	metricsv "k8s.io/metrics/pkg/client/clientset/versioned"
+)
+
+var (
+	kubeConfigPresent = false
+	kubeConfigPath    string
+)
+
+const (
+	// env variable that provides path to kube config file, if deploying from outside K8s cluster
+	kubeConfig = "KUBE_CONFIG"
+)
+
+func init() {
+	var ok bool
+	kubeConfigPath, ok = os.LookupEnv(kubeConfig)
+	if ok {
+		kubeConfigPresent = true
+	}
+}
+
+// This is a client for K8s provided Metric Server
+type metricsServerClient struct {
+	// This client fetches node metrics from metric server
+	metricsClientSet *metricsv.Clientset
+	// This client fetches node capacity
+	coreClientSet *kubernetes.Clientset
+}
+
+func NewMetricsServerClient() (watcher.MetricsProviderClient, error) {
+	var config *rest.Config
+	var err error
+	kubeConfig := ""
+	if kubeConfigPresent {
+		kubeConfig = kubeConfigPath
+	}
+	config, err = clientcmd.BuildConfigFromFlags("", kubeConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	metricsClientSet, err := metricsv.NewForConfig(config)
+	clientSet, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		return nil, err
+	}
+	return metricsServerClient{
+		metricsClientSet: metricsClientSet,
+		coreClientSet:    clientSet}, nil
+}
+
+func (m metricsServerClient) Name() string {
+	return watcher.K8sClientName
+}
+
+func (m metricsServerClient) FetchHostMetrics(host string, window *watcher.Window) ([]watcher.Metric, error) {
+	var metrics = []watcher.Metric{}
+
+	nodeMetrics, err := m.metricsClientSet.MetricsV1beta1().NodeMetricses().Get(context.TODO(), host, metav1.GetOptions{})
+	if err != nil {
+		return metrics, err
+	}
+	var cpuFetchedMetric watcher.Metric
+	var memFetchedMetric watcher.Metric
+	node, err := m.coreClientSet.CoreV1().Nodes().Get(context.Background(), host, metav1.GetOptions{})
+	if err != nil {
+		return metrics, err
+	}
+
+	// Added CPU latest metric
+	cpuFetchedMetric.Value = float64(100*nodeMetrics.Usage.Cpu().MilliValue()) / float64(node.Status.Capacity.Cpu().MilliValue())
+	cpuFetchedMetric.Type = watcher.CPU
+	cpuFetchedMetric.Operator = watcher.Latest
+	metrics = append(metrics, cpuFetchedMetric)
+
+	// Added Memory latest metric
+	memFetchedMetric.Value = float64(100*nodeMetrics.Usage.Memory().Value()) / float64(node.Status.Capacity.Memory().Value())
+	memFetchedMetric.Type = watcher.Memory
+	memFetchedMetric.Operator = watcher.Latest
+	metrics = append(metrics, memFetchedMetric)
+	return metrics, nil
+}
+
+func (m metricsServerClient) FetchAllHostsMetrics(window *watcher.Window) (map[string][]watcher.Metric, error) {
+	metrics := make(map[string][]watcher.Metric)
+
+	nodeMetricsList, err := m.metricsClientSet.MetricsV1beta1().NodeMetricses().List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		return metrics, err
+	}
+	nodeList, err := m.coreClientSet.CoreV1().Nodes().List(context.Background(), metav1.ListOptions{})
+	if err != nil {
+		return metrics, err
+	}
+
+	cpuNodeCapacityMap := make(map[string]int64)
+	memNodeCPUCapacityMap := make(map[string]int64)
+	for _, host := range nodeList.Items {
+		cpuNodeCapacityMap[host.Name] = host.Status.Capacity.Cpu().MilliValue()
+		memNodeCPUCapacityMap[host.Name] = host.Status.Capacity.Memory().Value()
+	}
+	for _, host := range nodeMetricsList.Items {
+		var cpuFetchedMetric watcher.Metric
+		cpuFetchedMetric.Type = watcher.CPU
+		cpuFetchedMetric.Operator = watcher.Latest
+		if _, ok := cpuNodeCapacityMap[host.Name]; !ok {
+			log.Errorf("unable to find host %v in node list caching cpu capacity", host.Name)
+			continue
+		}
+
+		cpuFetchedMetric.Value = float64(100*host.Usage.Cpu().MilliValue()) / float64(cpuNodeCapacityMap[host.Name])
+		metrics[host.Name] = append(metrics[host.Name], cpuFetchedMetric)
+
+		var memFetchedMetric watcher.Metric
+		memFetchedMetric.Type = watcher.Memory
+		memFetchedMetric.Operator = watcher.Latest
+		if _, ok := memNodeCPUCapacityMap[host.Name]; !ok {
+			log.Errorf("unable to find host %v in node list caching memory capacity", host.Name)
+			continue
+		}
+		memFetchedMetric.Value = float64(100*host.Usage.Memory().Value()) / float64(memNodeCPUCapacityMap[host.Name])
+		metrics[host.Name] = append(metrics[host.Name], memFetchedMetric)
+	}
+
+	return metrics, nil
+}
+
+func (m metricsServerClient) Health() (int, error) {
+	var status int
+	m.metricsClientSet.RESTClient().Verb("HEAD").Do(context.Background()).StatusCode(&status)
+	if status != http.StatusOK {
+		return -1, fmt.Errorf("received response status code: %v", status)
+	}
+	return 0, nil
+}
--- a/3rd/load-watcher/pkg/watcher/internal/metricsprovider/prometheus.go
+++ b/3rd/load-watcher/pkg/watcher/internal/metricsprovider/prometheus.go
@ -0,0 +1,319 @@
+/*
+Copyright 2020
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package metricsprovider
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"os"
+	"time"
+
+	"k8s.io/client-go/transport"
+
+	"github.com/paypal/load-watcher/pkg/watcher"
+	"github.com/prometheus/client_golang/api"
+	v1 "github.com/prometheus/client_golang/api/prometheus/v1"
+	"github.com/prometheus/common/config"
+	"github.com/prometheus/common/model"
+	log "github.com/sirupsen/logrus"
+
+	_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
+)
+
+const (
+	EnableOpenShiftAuth          = "ENABLE_OPENSHIFT_AUTH"
+	K8sPodCAFilePath             = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
+	DefaultPromAddress           = "http://prometheus-k8s:9090"
+	promStd                      = "stddev_over_time"
+	promAvg                      = "avg_over_time"
+	promCpuMetric                = "instance:node_cpu:ratio"
+	promMemMetric                = "instance:node_memory_utilisation:ratio"
+	promTransBandMetric          = "instance:node_network_transmit_bytes:rate:sum"
+	promTransBandDropMetric      = "instance:node_network_transmit_drop_excluding_lo:rate5m"
+	promRecBandMetric            = "instance:node_network_receive_bytes:rate:sum"
+	promRecBandDropMetric        = "instance:node_network_receive_drop_excluding_lo:rate5m"
+	promDiskIOMetric             = "instance_device:node_disk_io_time_seconds:rate5m"
+	promScaphHostPower           = "scaph_host_power_microwatts"
+	promScaphHostJoules          = "scaph_host_energy_microjoules"
+	promKeplerHostCoreJoules     = "kepler_node_core_joules_total"
+	promKeplerHostUncoreJoules   = "kepler_node_uncore_joules_total"
+	promKeplerHostDRAMJoules     = "kepler_node_dram_joules_total"
+	promKeplerHostPackageJoules  = "kepler_node_package_joules_total"
+	promKeplerHostOtherJoules    = "kepler_node_other_joules_total"
+	promKeplerHostGPUJoules      = "kepler_node_gpu_joules_total"
+	promKeplerHostPlatformJoules = "kepler_node_platform_joules_total"
+	promKeplerHostEnergyStat     = "kepler_node_energy_stat"
+	allHosts                     = "all"
+	hostMetricKey                = "node"
+)
+
+type promClient struct {
+	client      api.Client
+	promAddress string
+}
+
+func loadCAFile(filepath string) (*x509.CertPool, error) {
+	caCert, err := ioutil.ReadFile(filepath)
+	if err != nil {
+		return nil, err
+	}
+
+	caCertPool := x509.NewCertPool()
+	if ok := caCertPool.AppendCertsFromPEM(caCert); !ok {
+		return nil, fmt.Errorf("failed to append CA certificate to the pool")
+	}
+
+	return caCertPool, nil
+}
+
+func NewPromClient(opts watcher.MetricsProviderOpts) (watcher.MetricsProviderClient, error) {
+	if opts.Name != watcher.PromClientName {
+		return nil, fmt.Errorf("metric provider name should be %v, found %v", watcher.PromClientName, opts.Name)
+	}
+
+	var client api.Client
+	var err error
+	var promToken, promAddress = "", DefaultPromAddress
+	if opts.AuthToken != "" {
+		promToken = opts.AuthToken
+	}
+	if opts.Address != "" {
+		promAddress = opts.Address
+	}
+
+	// Ignore TLS verify errors if InsecureSkipVerify is set
+	roundTripper := api.DefaultRoundTripper
+
+	// Check if EnableOpenShiftAuth is set.
+	_, enableOpenShiftAuth := os.LookupEnv(EnableOpenShiftAuth)
+	if enableOpenShiftAuth {
+		// Retrieve Pod CA cert
+		caCertPool, err := loadCAFile(K8sPodCAFilePath)
+		if err != nil {
+			return nil, fmt.Errorf("Error loading CA file: %v", err)
+		}
+
+		// Get Prometheus Host
+		u, _ := url.Parse(opts.Address)
+		roundTripper = transport.NewBearerAuthRoundTripper(
+			opts.AuthToken,
+			&http.Transport{
+				Proxy: http.ProxyFromEnvironment,
+				DialContext: (&net.Dialer{
+					Timeout:   30 * time.Second,
+					KeepAlive: 30 * time.Second,
+				}).DialContext,
+				TLSHandshakeTimeout: 10 * time.Second,
+				TLSClientConfig: &tls.Config{
+					RootCAs:    caCertPool,
+					ServerName: u.Host,
+				},
+			},
+		)
+	} else if opts.InsecureSkipVerify {
+		roundTripper = &http.Transport{
+			Proxy: http.ProxyFromEnvironment,
+			DialContext: (&net.Dialer{
+				Timeout:   30 * time.Second,
+				KeepAlive: 30 * time.Second,
+			}).DialContext,
+			TLSHandshakeTimeout: 10 * time.Second,
+			TLSClientConfig:     &tls.Config{InsecureSkipVerify: true},
+		}
+	}
+
+	if promToken != "" {
+		client, err = api.NewClient(api.Config{
+			Address:      promAddress,
+			RoundTripper: config.NewAuthorizationCredentialsRoundTripper("Bearer", config.NewInlineSecret(opts.AuthToken), roundTripper),
+		})
+	} else {
+		client, err = api.NewClient(api.Config{
+			Address: promAddress,
+		})
+	}
+
+	if err != nil {
+		log.Errorf("error creating prometheus client: %v", err)
+		return nil, err
+	}
+
+	return promClient{
+		client:      client,
+		promAddress: promAddress,
+	}, err
+}
+
+func (s promClient) Name() string {
+	return watcher.PromClientName
+}
+
+func (s promClient) FetchHostMetrics(host string, window *watcher.Window) ([]watcher.Metric, error) {
+	var metricList []watcher.Metric
+	var anyerr error
+
+	for _, method := range []string{promAvg, promStd} {
+		for _, metric := range []string{promCpuMetric, promMemMetric, promTransBandMetric, promTransBandDropMetric, promRecBandMetric, promRecBandDropMetric,
+			promDiskIOMetric, promScaphHostPower, promScaphHostJoules, promKeplerHostCoreJoules, promKeplerHostUncoreJoules, promKeplerHostDRAMJoules,
+			promKeplerHostPackageJoules, promKeplerHostOtherJoules, promKeplerHostGPUJoules, promKeplerHostPlatformJoules, promKeplerHostEnergyStat} {
+			promQuery := s.buildPromQuery(host, metric, method, window.Duration)
+			promResults, err := s.getPromResults(promQuery)
+
+			if err != nil {
+				log.Errorf("error querying Prometheus for query %v: %v\n", promQuery, err)
+				anyerr = err
+				continue
+			}
+
+			curMetricMap := s.promResults2MetricMap(promResults, metric, method, window.Duration)
+			metricList = append(metricList, curMetricMap[host]...)
+		}
+	}
+
+	return metricList, anyerr
+}
+
+// FetchAllHostsMetrics Fetch all host metrics with different operators (avg_over_time, stddev_over_time) and different resource types (CPU, Memory)
+func (s promClient) FetchAllHostsMetrics(window *watcher.Window) (map[string][]watcher.Metric, error) {
+	hostMetrics := make(map[string][]watcher.Metric)
+	var anyerr error
+
+	for _, method := range []string{promAvg, promStd} {
+		for _, metric := range []string{promCpuMetric, promMemMetric, promTransBandMetric, promTransBandDropMetric, promRecBandMetric, promRecBandDropMetric,
+			promDiskIOMetric, promScaphHostPower, promScaphHostJoules, promKeplerHostCoreJoules, promKeplerHostUncoreJoules, promKeplerHostDRAMJoules,
+			promKeplerHostPackageJoules, promKeplerHostOtherJoules, promKeplerHostGPUJoules, promKeplerHostPlatformJoules, promKeplerHostEnergyStat} {
+			promQuery := s.buildPromQuery(allHosts, metric, method, window.Duration)
+			promResults, err := s.getPromResults(promQuery)
+
+			if err != nil {
+				log.Errorf("error querying Prometheus for query %v: %v\n", promQuery, err)
+				anyerr = err
+				continue
+			}
+
+			curMetricMap := s.promResults2MetricMap(promResults, metric, method, window.Duration)
+
+			for k, v := range curMetricMap {
+				// skip empty keys
+				if k == "" {
+					continue
+				}
+				hostMetrics[k] = append(hostMetrics[k], v...)
+			}
+		}
+	}
+
+	return hostMetrics, anyerr
+}
+
+func (s promClient) Health() (int, error) {
+	req, err := http.NewRequest("HEAD", s.promAddress, nil)
+	if err != nil {
+		return -1, err
+	}
+	resp, _, err := s.client.Do(context.Background(), req)
+	if err != nil {
+		return -1, err
+	}
+	if resp.StatusCode != http.StatusOK {
+		return -1, fmt.Errorf("received response status code: %v", resp.StatusCode)
+	}
+	return 0, nil
+}
+
+func (s promClient) buildPromQuery(host string, metric string, method string, rollup string) string {
+	var promQuery string
+
+	if host == allHosts {
+		promQuery = fmt.Sprintf("%s(%s[%s])", method, metric, rollup)
+	} else {
+		promQuery = fmt.Sprintf("%s(%s{%s=\"%s\"}[%s])", method, metric, hostMetricKey, host, rollup)
+	}
+
+	return promQuery
+}
+
+func (s promClient) getPromResults(promQuery string) (model.Value, error) {
+	v1api := v1.NewAPI(s.client)
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	results, warnings, err := v1api.Query(ctx, promQuery, time.Now())
+	if err != nil {
+		return nil, err
+	}
+	if len(warnings) > 0 {
+		log.Warnf("Warnings: %v\n", warnings)
+	}
+	log.Debugf("result:\n%v\n", results)
+
+	return results, nil
+}
+
+func (s promClient) promResults2MetricMap(promresults model.Value, metric string, method string, rollup string) map[string][]watcher.Metric {
+	var metricType string
+	var operator string
+
+	curMetrics := make(map[string][]watcher.Metric)
+
+	switch metric {
+	case promCpuMetric: // CPU metrics
+		metricType = watcher.CPU
+	case promMemMetric: // Memory metrics
+		metricType = watcher.Memory
+	case promDiskIOMetric: // Storage metrics
+		metricType = watcher.Storage
+	case promScaphHostPower, promScaphHostJoules, // Energy-related metrics
+		promKeplerHostCoreJoules, promKeplerHostUncoreJoules,
+		promKeplerHostDRAMJoules, promKeplerHostPackageJoules,
+		promKeplerHostOtherJoules, promKeplerHostGPUJoules,
+		promKeplerHostPlatformJoules, promKeplerHostEnergyStat:
+		metricType = watcher.Energy
+	case promTransBandMetric, promTransBandDropMetric, // Bandwidth-related metrics
+		promRecBandMetric, promRecBandDropMetric:
+		metricType = watcher.Bandwidth
+	default:
+		metricType = watcher.Unknown
+	}
+
+	if method == promAvg {
+		operator = watcher.Average
+	} else if method == promStd {
+		operator = watcher.Std
+	} else {
+		operator = watcher.UnknownOperator
+	}
+
+	switch promresults.(type) {
+	case model.Vector:
+		for _, result := range promresults.(model.Vector) {
+			curMetric := watcher.Metric{Name: metric, Type: metricType, Operator: operator, Rollup: rollup, Value: float64(result.Value * 100)}
+			curHost := string(result.Metric[hostMetricKey])
+			curMetrics[curHost] = append(curMetrics[curHost], curMetric)
+		}
+	default:
+		log.Errorf("error: The Prometheus results should not be type: %v.\n", promresults.Type())
+	}
+
+	return curMetrics
+}
--- a/3rd/load-watcher/pkg/watcher/internal/metricsprovider/signalfx.go
+++ b/3rd/load-watcher/pkg/watcher/internal/metricsprovider/signalfx.go
@ -0,0 +1,467 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package metricsprovider
+
+import (
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/paypal/load-watcher/pkg/watcher"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	// SignalFX Request Params
+	DefaultSignalFxAddress    = "https://api.signalfx.com"
+	signalFxMetricsAPI        = "/v1/timeserieswindow"
+	signalFxMetdataAPI        = "/v2/metrictimeseries"
+	signalFxHostFilter        = "host:"
+	signalFxClusterFilter     = "cluster:"
+	signalFxHostNameSuffixKey = "SIGNALFX_HOST_NAME_SUFFIX"
+	signalFxClusterName       = "SIGNALFX_CLUSTER_NAME"
+	// SignalFX Query Params
+	oneMinuteResolutionMs   = 60000
+	cpuUtilizationMetric    = `sf_metric:"cpu.utilization"`
+	memoryUtilizationMetric = `sf_metric:"memory.utilization"`
+	AND                     = "AND"
+	resultSetLimit          = "10000"
+
+	// Miscellaneous
+	httpClientTimeout = 55 * time.Second
+)
+
+type signalFxClient struct {
+	client          http.Client
+	authToken       string
+	signalFxAddress string
+	hostNameSuffix  string
+	clusterName     string
+}
+
+func NewSignalFxClient(opts watcher.MetricsProviderOpts) (watcher.MetricsProviderClient, error) {
+	if opts.Name != watcher.SignalFxClientName {
+		return nil, fmt.Errorf("metric provider name should be %v, found %v", watcher.SignalFxClientName, opts.Name)
+	}
+	tlsConfig := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: opts.InsecureSkipVerify}, // TODO(aqadeer): Figure out a secure way to let users add SSL certs
+	}
+	hostNameSuffix, _ := os.LookupEnv(signalFxHostNameSuffixKey)
+	clusterName, _ := os.LookupEnv(signalFxClusterName)
+	var signalFxAddress, signalFxAuthToken = DefaultSignalFxAddress, ""
+	if opts.Address != "" {
+		signalFxAddress = opts.Address
+	}
+	if opts.AuthToken != "" {
+		signalFxAuthToken = opts.AuthToken
+	}
+	if signalFxAuthToken == "" {
+		log.Fatalf("No auth token found to connect with SignalFx server")
+	}
+	return signalFxClient{client: http.Client{
+		Timeout:   httpClientTimeout,
+		Transport: tlsConfig},
+		authToken:       signalFxAuthToken,
+		signalFxAddress: signalFxAddress,
+		hostNameSuffix:  hostNameSuffix,
+		clusterName:     clusterName}, nil
+}
+
+func (s signalFxClient) Name() string {
+	return watcher.SignalFxClientName
+}
+
+func (s signalFxClient) FetchHostMetrics(host string, window *watcher.Window) ([]watcher.Metric, error) {
+	log.Debugf("fetching metrics for host %v", host)
+	var metrics []watcher.Metric
+	hostFilter := signalFxHostFilter + host + s.hostNameSuffix
+	clusterFilter := signalFxClusterFilter + s.clusterName
+	for _, metric := range []string{cpuUtilizationMetric, memoryUtilizationMetric} {
+		uri, err := s.buildMetricURL(hostFilter, clusterFilter, metric, window)
+		if err != nil {
+			return metrics, fmt.Errorf("received error when building metric URL: %v", err)
+		}
+		req, _ := http.NewRequest(http.MethodGet, uri.String(), nil)
+		req.Header.Set("X-SF-Token", s.authToken)
+		req.Header.Set("Content-Type", "application/json")
+
+		resp, err := s.client.Do(req)
+		if err != nil {
+			return metrics, fmt.Errorf("received error in metric API call: %v", err)
+		}
+		defer resp.Body.Close()
+		if resp.StatusCode != http.StatusOK {
+			return metrics, fmt.Errorf("received status code: %v", resp.StatusCode)
+		}
+		var res interface{}
+		err = json.NewDecoder(resp.Body).Decode(&res)
+		if err != nil {
+			return metrics, fmt.Errorf("received error in decoding resp: %v", err)
+		}
+
+		var fetchedMetric watcher.Metric
+		addMetadata(&fetchedMetric, metric)
+		fetchedMetric.Value, err = decodeMetricsPayload(res)
+		if err != nil {
+			return metrics, err
+		}
+		metrics = append(metrics, fetchedMetric)
+	}
+	return metrics, nil
+}
+
+func (s signalFxClient) FetchAllHostsMetrics(window *watcher.Window) (map[string][]watcher.Metric, error) {
+	hostFilter := signalFxHostFilter + "*" + s.hostNameSuffix
+	clusterFilter := signalFxClusterFilter + s.clusterName
+	metrics := make(map[string][]watcher.Metric)
+	for _, metric := range []string{cpuUtilizationMetric, memoryUtilizationMetric} {
+		uri, err := s.buildMetricURL(hostFilter, clusterFilter, metric, window)
+		if err != nil {
+			return metrics, fmt.Errorf("received error when building metric URL: %v", err)
+		}
+		req := s.requestWithAuthToken(uri.String())
+		metricResp, err := s.client.Do(req)
+		if err != nil {
+			return metrics, fmt.Errorf("received error in metric API call: %v", err)
+		}
+		defer metricResp.Body.Close()
+		if metricResp.StatusCode != http.StatusOK {
+			return metrics, fmt.Errorf("received status code for metric resp: %v", metricResp.StatusCode)
+		}
+		var metricPayload interface{}
+		err = json.NewDecoder(metricResp.Body).Decode(&metricPayload)
+		if err != nil {
+			return metrics, fmt.Errorf("received error in decoding resp: %v", err)
+		}
+
+		uri, err = s.buildMetadataURL(hostFilter, clusterFilter, metric)
+		if err != nil {
+			return metrics, fmt.Errorf("received error when building metadata URL: %v", err)
+		}
+		req = s.requestWithAuthToken(uri.String())
+		metadataResp, err := s.client.Do(req)
+		if err != nil {
+			return metrics, fmt.Errorf("received error in metadata API call: %v", err)
+		}
+		defer metadataResp.Body.Close()
+		if metadataResp.StatusCode != http.StatusOK {
+			return metrics, fmt.Errorf("received status code for metadata resp: %v", metadataResp.StatusCode)
+		}
+		var metadataPayload interface{}
+		err = json.NewDecoder(metadataResp.Body).Decode(&metadataPayload)
+		if err != nil {
+			return metrics, fmt.Errorf("received error in decoding metadata payload: %v", err)
+		}
+		mappedMetrics, err := getMetricsFromPayloads(metricPayload, metadataPayload)
+		if err != nil {
+			return metrics, fmt.Errorf("received error in getting metrics from payload: %v", err)
+		}
+		for k, v := range mappedMetrics {
+			addMetadata(&v, metric)
+			metrics[k] = append(metrics[k], v)
+		}
+	}
+	return metrics, nil
+}
+
+func (s signalFxClient) Health() (int, error) {
+	return Ping(s.client, s.signalFxAddress)
+}
+
+func (s signalFxClient) requestWithAuthToken(uri string) *http.Request {
+	req, _ := http.NewRequest(http.MethodGet, uri, nil)
+	req.Header.Set("X-SF-Token", s.authToken)
+	req.Header.Set("Content-Type", "application/json")
+	return req
+}
+
+// Simple ping utility to a given URL
+// Returns -1 if unhealthy, 0 if healthy along with error if any
+func Ping(client http.Client, url string) (int, error) {
+	req, err := http.NewRequest("HEAD", url, nil)
+	if err != nil {
+		return -1, err
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return -1, err
+	}
+	if resp.StatusCode != http.StatusOK {
+		return -1, fmt.Errorf("received response code: %v", resp.StatusCode)
+	}
+	return 0, nil
+}
+
+func addMetadata(metric *watcher.Metric, metricType string) {
+	metric.Operator = watcher.Average
+	if metricType == cpuUtilizationMetric {
+		metric.Name = cpuUtilizationMetric
+		metric.Type = watcher.CPU
+	} else {
+		metric.Name = memoryUtilizationMetric
+		metric.Type = watcher.Memory
+	}
+}
+
+func (s signalFxClient) buildMetricURL(hostFilter string, clusterFilter string, metric string, window *watcher.Window) (uri *url.URL, err error) {
+	uri, err = url.Parse(s.signalFxAddress + signalFxMetricsAPI)
+	if err != nil {
+		return nil, err
+	}
+	q := uri.Query()
+
+	builder := strings.Builder{}
+	builder.WriteString(hostFilter)
+	builder.WriteString(fmt.Sprintf(" %v ", AND))
+	builder.WriteString(clusterFilter)
+	builder.WriteString(fmt.Sprintf(" %v ", AND))
+	builder.WriteString(metric)
+	q.Set("query", builder.String())
+	q.Set("startMs", strconv.FormatInt(window.Start*1000, 10))
+	q.Set("endMs", strconv.FormatInt(window.End*1000, 10))
+	q.Set("resolution", strconv.Itoa(oneMinuteResolutionMs))
+	uri.RawQuery = q.Encode()
+	return
+}
+
+func (s signalFxClient) buildMetadataURL(host string, clusterFilter string, metric string) (uri *url.URL, err error) {
+	uri, err = url.Parse(s.signalFxAddress + signalFxMetdataAPI)
+	if err != nil {
+		return nil, err
+	}
+	q := uri.Query()
+
+	builder := strings.Builder{}
+	builder.WriteString(host)
+	builder.WriteString(fmt.Sprintf(" %v ", AND))
+	builder.WriteString(clusterFilter)
+	builder.WriteString(fmt.Sprintf(" %v ", AND))
+	builder.WriteString(metric)
+	q.Set("query", builder.String())
+	q.Set("limit", resultSetLimit)
+	uri.RawQuery = q.Encode()
+	return
+}
+
+/**
+Sample payload:
+{
+  "data": {
+    "Ehql_bxBgAc": [
+      [
+        1600213380000,
+        84.64246793530153
+      ]
+    ]
+  },
+  "errors": []
+}
+*/
+func decodeMetricsPayload(payload interface{}) (float64, error) {
+	var data interface{}
+	data = payload.(map[string]interface{})["data"]
+	if data == nil {
+		return -1, errors.New("unexpected payload: missing data field")
+	}
+	keyMap, ok := data.(map[string]interface{})
+	if !ok {
+		return -1, errors.New("unable to deserialise data field")
+	}
+
+	var values []interface{}
+	if len(keyMap) == 0 {
+		return -1, errors.New("no values found")
+	}
+	for _, v := range keyMap {
+		values, ok = v.([]interface{})
+		if !ok {
+			return -1, errors.New("unable to deserialise values")
+		}
+		break
+	}
+	if len(values) == 0 {
+		return -1, errors.New("no metric value array could be decoded")
+	}
+
+	var timestampUtilisation []interface{}
+	// Choose the latest window out of multiple values returned
+	timestampUtilisation, ok = values[len(values)-1].([]interface{})
+	if !ok {
+		return -1, errors.New("unable to deserialise metric values")
+	}
+	return timestampUtilisation[1].(float64), nil
+}
+
+/**
+Sample metricData payload:
+{
+  "data": {
+    "Ehql_bxBgAc": [
+      [
+        1600213380000,
+        84.64246793530153
+      ]
+    ],
+    "EuXgJm7BkAA": [
+	  [
+		1614634260000,
+		5.450946379084264
+     ]
+    ],
+    ....
+    ....
+  },
+  "errors": []
+}
+
+https://dev.splunk.com/observability/reference/api/metrics_metadata/latest#endpoint-retrieve-metric-timeseries-metadata
+Sample metaData payload:
+{
+    "count": 5,
+    "partialCount": false,
+    "results": [
+        {
+            "active": true,
+            "created": 1614534848000,
+            "creator": null,
+            "dimensions": {
+                "host": "test.dev.com",
+                "sf_metric": null
+            },
+        "id": "EvVH6P7BgAA",
+		"lastUpdated": 0,
+		"lastUpdatedBy": null,
+		"metric": "cpu.utilization"
+       },
+       ....
+       ....
+	]
+}
+*/
+func getMetricsFromPayloads(metricData interface{}, metadata interface{}) (map[string]watcher.Metric, error) {
+	keyHostMap := make(map[string]string)
+	hostMetricMap := make(map[string]watcher.Metric)
+	if _, ok := metadata.(map[string]interface{}); !ok {
+		return hostMetricMap, fmt.Errorf("type conversion failed, found %T", metadata)
+	}
+	results := metadata.(map[string]interface{})["results"]
+	if results == nil {
+		return hostMetricMap, errors.New("unexpected payload: missing results field")
+	}
+
+	for _, v := range results.([]interface{}) {
+		_, ok := v.(map[string]interface{})
+		if !ok {
+			log.Errorf("type conversion failed, found %T", v)
+			continue
+		}
+		id := v.(map[string]interface{})["id"]
+		if id == nil {
+			log.Errorf("id not found in %v", v)
+			continue
+		}
+		_, ok = id.(string)
+		if !ok {
+			log.Errorf("id not expected type string, found %T", id)
+			continue
+		}
+		dimensions := v.(map[string]interface{})["dimensions"]
+		if dimensions == nil {
+			log.Errorf("no dimensions found in %v", v)
+			continue
+		}
+		_, ok = dimensions.(map[string]interface{})
+		if !ok {
+			log.Errorf("type conversion failed, found %T", dimensions)
+			continue
+		}
+		host := dimensions.(map[string]interface{})["host"]
+		if host == nil {
+			log.Errorf("no host found in %v", dimensions)
+			continue
+		}
+		if _, ok := host.(string); !ok {
+			log.Errorf("host not expected type string, found %T", host)
+		}
+
+		keyHostMap[id.(string)] = extractHostName(host.(string))
+	}
+
+	var data interface{}
+	data = metricData.(map[string]interface{})["data"]
+	if data == nil {
+		return hostMetricMap, errors.New("unexpected payload: missing data field")
+	}
+	keyMetricMap, ok := data.(map[string]interface{})
+	if !ok {
+		return hostMetricMap, errors.New("unable to deserialise data field")
+	}
+	for key, metric := range keyMetricMap {
+		if _, ok := keyHostMap[key]; !ok {
+			log.Errorf("no metadata found for key %v", key)
+			continue
+		}
+		values, ok := metric.([]interface{})
+		if !ok {
+			log.Errorf("unable to deserialise values for key %v", key)
+			continue
+		}
+		if len(values) == 0 {
+			log.Errorf("no metric value array could be decoded for key %v", key)
+			continue
+		}
+		// Find the average across returned values per 1 minute resolution
+		var sum float64
+		var count float64
+		for _, value := range values {
+			var timestampUtilisation []interface{}
+			timestampUtilisation, ok = value.([]interface{})
+			if !ok || len(timestampUtilisation) < 2 {
+				log.Errorf("unable to deserialise metric values for key %v", key)
+				continue
+			}
+			if _, ok := timestampUtilisation[1].(float64); !ok {
+				log.Errorf("unable to typecast value to float64: %v of type %T", timestampUtilisation, timestampUtilisation)
+			}
+			sum += timestampUtilisation[1].(float64)
+			count += 1
+		}
+
+		fetchedMetric := watcher.Metric{Value: sum / count}
+		hostMetricMap[keyHostMap[key]] = fetchedMetric
+	}
+
+	return hostMetricMap, nil
+}
+
+// This function checks and extracts node name from its FQDN if present
+// It assumes that node names themselves don't contain "."
+// Example: alpha.dev.k8s.com is returned as alpha
+func extractHostName(fqdn string) string {
+	index := strings.Index(fqdn, ".")
+	if index != -1 {
+		return fqdn[:index]
+	}
+	return fqdn
+}
--- a/3rd/load-watcher/pkg/watcher/internal/metricsprovider/signalfx_test.go
+++ b/3rd/load-watcher/pkg/watcher/internal/metricsprovider/signalfx_test.go
@ -0,0 +1,99 @@
+package metricsprovider
+
+import (
+	"github.com/paypal/load-watcher/pkg/watcher"
+	"github.com/stretchr/testify/assert"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestNewSignalFxClient(t *testing.T) {
+	opts := watcher.MetricsProviderOpts{
+		Name:      watcher.SignalFxClientName,
+		Address:   "",
+		AuthToken: "Test",
+	}
+	_, err := NewSignalFxClient(opts)
+	assert.Nil(t, err)
+
+	opts.Name = "invalid"
+	_, err = NewSignalFxClient(opts)
+	assert.NotNil(t, err)
+}
+
+func TestFetchAllHostMetrics(t *testing.T) {
+	metricData := `{
+  "data": {
+    "Ehql_bxBgAc": [
+      [
+        1600213380000,
+        84.64246793530153
+      ]
+    ],
+    "EuXgJm7BkAA": [
+	  [
+		1614634260000,
+		5.450946379084264
+     ]
+    ]
+  },
+  "errors": []
+}`
+	metaData := `{
+   "count":2,
+   "partialCount":false,
+   "results":[
+      {
+         "active":true,
+         "created":1614534848000,
+         "creator":null,
+         "dimensions":{
+            "host":"test1.dev.com",
+            "sf_metric":null
+         },
+         "id":"Ehql_bxBgAc",
+         "lastUpdated":0,
+         "lastUpdatedBy":null,
+         "metric":"cpu.utilization"
+      },
+      {
+         "active":true,
+         "created":1614534848000,
+         "creator":null,
+         "dimensions":{
+            "host":"test2.dev.com",
+            "sf_metric":null
+         },
+         "id":"EuXgJm7BkAA",
+         "lastUpdated":0,
+         "lastUpdatedBy":null,
+         "metric":"cpu.utilization"
+      }
+   ]
+}`
+	server := httptest.NewServer(http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
+		if strings.Contains(req.URL.Path, signalFxMetdataAPI) {
+			resp.Write([]byte(metaData))
+		} else {
+			resp.Write([]byte(metricData))
+		}
+	}))
+	opts := watcher.MetricsProviderOpts{
+		Name:      watcher.SignalFxClientName,
+		Address:   server.URL,
+		AuthToken: "PWNED",
+	}
+
+	client, err := NewSignalFxClient(opts)
+	assert.Nil(t, err)
+
+	metrics, err := client.FetchAllHostsMetrics(watcher.CurrentFifteenMinuteWindow())
+	assert.Nil(t, err)
+	assert.NotNil(t, metrics)
+	assert.NotNil(t, metrics["test1"])
+	assert.NotNil(t, metrics["test2"])
+
+	defer server.Close()
+}
--- a/3rd/load-watcher/pkg/watcher/metricsprovider.go
+++ b/3rd/load-watcher/pkg/watcher/metricsprovider.go
@ -0,0 +1,74 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package watcher
+
+import (
+	"os"
+	"strings"
+)
+
+const (
+	K8sClientName      = "KubernetesMetricsServer"
+	PromClientName     = "Prometheus"
+	SignalFxClientName = "SignalFx"
+
+	MetricsProviderNameKey    = "METRICS_PROVIDER_NAME"
+	MetricsProviderAddressKey = "METRICS_PROVIDER_ADDRESS"
+	MetricsProviderTokenKey   = "METRICS_PROVIDER_TOKEN"
+	InsecureSkipVerify        = "INSECURE_SKIP_VERIFY"
+)
+
+var (
+	EnvMetricProviderOpts MetricsProviderOpts
+)
+
+func init() {
+	var ok bool
+	EnvMetricProviderOpts.Name, ok = os.LookupEnv(MetricsProviderNameKey)
+	if !ok {
+		EnvMetricProviderOpts.Name = K8sClientName
+	}
+	EnvMetricProviderOpts.Address, ok = os.LookupEnv(MetricsProviderAddressKey)
+	EnvMetricProviderOpts.AuthToken, ok = os.LookupEnv(MetricsProviderTokenKey)
+	insecureVerify, _ := os.LookupEnv(InsecureSkipVerify)
+	if strings.ToLower(insecureVerify) == "true" {
+		EnvMetricProviderOpts.InsecureSkipVerify = true
+	} else {
+		EnvMetricProviderOpts.InsecureSkipVerify = false
+	}
+}
+
+// Interface to be implemented by any metrics provider client to interact with Watcher
+type MetricsProviderClient interface {
+	// Return the client name
+	Name() string
+	// Fetch metrics for given host
+	FetchHostMetrics(host string, window *Window) ([]Metric, error)
+	// Fetch metrics for all hosts
+	FetchAllHostsMetrics(window *Window) (map[string][]Metric, error)
+	// Get metric provider server health status
+	// Returns 0 if healthy, -1 if unhealthy along with error if any
+	Health() (int, error)
+}
+
+// Generic metrics provider options
+type MetricsProviderOpts struct {
+	Name               string
+	Address            string
+	AuthToken          string
+	InsecureSkipVerify bool
+}
--- a/3rd/load-watcher/pkg/watcher/schema/watcher-example.json
+++ b/3rd/load-watcher/pkg/watcher/schema/watcher-example.json
@ -0,0 +1,53 @@
+{
+  "timestamp": 1556987522,
+  "window": {
+    "duration": "15m",
+    "start": 1556984522,
+    "end": 1556985422
+  },
+  "source": "InfluxDB",
+  "data": {
+    "node-1": {
+      "metrics": [
+        {
+          "name": "host.cpu.utilisation",
+          "type": "cpu",
+          "rollup": "AVG",
+          "value": 20
+        },
+        {
+          "name": "host.memory.utilisation",
+          "type": "memory",
+          "rollup": "STD",
+          "value": 5
+        }
+      ],
+      "tags": {},
+      "metadata": {
+        "dataCenter": "data-center-1",
+        "pool": "critical-apps"
+      }
+    },
+    "node-2": {
+      "metrics": [
+        {
+          "name": "host.cpu.utilisation",
+          "type": "cpu",
+          "rollup": "AVG",
+          "value": 20
+        },
+        {
+          "name": "host.memory.utilisation",
+          "type": "memory",
+          "rollup": "STD",
+          "value": 5
+        }
+      ]
+    },
+    "metadata": {
+      "dataCenter": "data-center-2",
+      "pool": "light-apps"
+    },
+    "tags": {}
+  }
+}
--- a/3rd/load-watcher/pkg/watcher/schema/watcher-schema.json
+++ b/3rd/load-watcher/pkg/watcher/schema/watcher-schema.json
@ -0,0 +1,125 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
+  "properties": {
+    "timestamp": {
+      "type": "integer"
+    },
+    "window": {
+      "type": "object",
+      "properties": {
+        "duration": {
+          "type": "string"
+        },
+        "start": {
+          "type": "integer"
+        },
+        "end": {
+          "type": "integer"
+        }
+      },
+      "required": [
+        "duration",
+        "start",
+        "end"
+      ]
+    },
+    "source": {
+      "type": "string"
+    },
+    "data": {
+      "type": "object",
+      "patternProperties": {
+        "^[0-9]+$": {
+          "type": "object",
+          "properties": {
+            "metrics": {
+              "type": "array",
+              "items": [
+                {
+                  "type": "object",
+                  "properties": {
+                    "name": {
+                      "type": "string"
+                    },
+                    "type": {
+                      "type": "string"
+                    },
+                    "operator": {
+                      "type": "string"
+                    },
+                    "rollup": {
+                      "type": "string"
+                    },
+                    "value": {
+                      "type": "integer",
+                      "description": "percentage value"
+                    }
+                  },
+                  "required": [
+                    "name",
+                    "type",
+                    "operator",
+                    "rollup",
+                    "value"
+                  ]
+                },
+                {
+                  "type": "object",
+                  "properties": {
+                    "name": {
+                      "type": "string"
+                    },
+                    "type": {
+                      "type": "string"
+                    },
+                    "operator": {
+                      "type": "string"
+                    },
+                    "rollup": {
+                      "type": "string"
+                    },
+                    "value": {
+                      "type": "integer",
+                      "description": "percentage value"
+                    }
+                  },
+                  "required": [
+                    "name",
+                    "type",
+                    "operator",
+                    "rollup",
+                    "value"
+                  ]
+                }
+              ]
+            },
+            "tags": {
+              "type": "object"
+            },
+            "metadata": {
+              "type": "object",
+              "properties": {
+                "dataCenter": {
+                  "type": "string"
+                },
+                "pool": {
+                  "type": "string"
+                }
+              }
+            }
+          },
+          "required": [
+            "metrics"
+          ]
+        }
+      }
+    }
+  },
+  "required": [
+    "timestamp",
+    "window",
+    "source",
+    "data"
+  ]
+}
--- a/3rd/load-watcher/pkg/watcher/testserver.go
+++ b/3rd/load-watcher/pkg/watcher/testserver.go
@ -0,0 +1,121 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package watcher
+
+var FifteenMinutesMetricsMap = map[string][]Metric{
+	FirstNode: {
+		{
+			Name:  "test-cpu",
+			Type:  CPU,
+			Value: 26,
+		},
+	},
+	SecondNode: {
+		{
+			Name:  "test-cpu",
+			Type:  CPU,
+			Value: 60,
+		},
+	},
+}
+
+var TenMinutesMetricsMap = map[string][]Metric{
+	FirstNode: {
+		{
+			Name:  "test-cpu",
+			Type:  CPU,
+			Value: 22,
+		},
+	},
+	SecondNode: {
+		{
+			Name:  "test-cpu",
+			Type:  CPU,
+			Value: 65,
+		},
+	},
+}
+
+var FiveMinutesMetricsMap = map[string][]Metric{
+	FirstNode: {
+		{
+			Name:  "test-cpu",
+			Type:  CPU,
+			Value: 21,
+		},
+	},
+	SecondNode: {
+		{
+			Name:  "test-cpu",
+			Type:  CPU,
+			Value: 50,
+		},
+	},
+}
+
+var _ MetricsProviderClient = &testServerClient{}
+
+const (
+	FirstNode            = "worker-1"
+	SecondNode           = "worker-2"
+	TestServerClientName = "TestServerClient"
+)
+
+type testServerClient struct {
+}
+
+func (t testServerClient) Name() string {
+	return TestServerClientName
+}
+
+func NewTestMetricsServerClient() MetricsProviderClient {
+	return testServerClient{}
+}
+
+func (t testServerClient) FetchHostMetrics(host string, window *Window) ([]Metric, error) {
+	if _, ok := FifteenMinutesMetricsMap[host]; !ok {
+		return nil, nil
+	}
+	if _, ok := TenMinutesMetricsMap[host]; !ok {
+		return nil, nil
+	}
+	if _, ok := FiveMinutesMetricsMap[host]; !ok {
+		return nil, nil
+	}
+
+	if window.Duration == TenMinutes {
+		return TenMinutesMetricsMap[host], nil
+	} else if window.Duration == FiveMinutes {
+		return FiveMinutesMetricsMap[host], nil
+	}
+
+	return FifteenMinutesMetricsMap[host], nil
+}
+
+func (t testServerClient) FetchAllHostsMetrics(window *Window) (map[string][]Metric, error) {
+	if window.Duration == TenMinutes {
+		return TenMinutesMetricsMap, nil
+	} else if window.Duration == FiveMinutes {
+		return FiveMinutesMetricsMap, nil
+	}
+
+	return FifteenMinutesMetricsMap, nil
+}
+
+func (t testServerClient) Health() (int, error) {
+	return 0, nil
+}
--- a/3rd/load-watcher/pkg/watcher/watcher.go
+++ b/3rd/load-watcher/pkg/watcher/watcher.go
@ -0,0 +1,350 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+Package Watcher is responsible for watching latest metrics from metrics provider via a fetcher client.
+It exposes an HTTP REST endpoint to get these metrics, in addition to application API via clients
+This also uses a fast json parser
+*/
+package watcher
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/francoispqt/gojay"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	BaseUrl         = "/watcher"
+	HealthCheckUrl  = "/watcher/health"
+	FifteenMinutes  = "15m"
+	TenMinutes      = "10m"
+	FiveMinutes     = "5m"
+	CPU             = "CPU"
+	Memory          = "Memory"
+	Bandwidth       = "Bandwidth"
+	Storage         = "Storage"
+	Energy          = "Energy"
+	Unknown         = "Unknown"
+	Average         = "AVG"
+	Std             = "STD"
+	Latest          = "Latest"
+	UnknownOperator = "Unknown"
+)
+
+type Watcher struct {
+	mutex         sync.RWMutex // For thread safe access to cache
+	fifteenMinute []WatcherMetrics
+	tenMinute     []WatcherMetrics
+	fiveMinute    []WatcherMetrics
+	cacheSize     int
+	client        MetricsProviderClient
+	isStarted     bool // Indicates if the Watcher is started by calling StartWatching()
+	shutdown      chan os.Signal
+}
+
+type Window struct {
+	Duration string `json:"duration"`
+	Start    int64  `json:"start"`
+	End      int64  `json:"end"`
+}
+
+type Metric struct {
+	Name     string  `json:"name"`             // Name of metric at the provider
+	Type     string  `json:"type"`             // CPU or Memory
+	Operator string  `json:"operator"`         // STD or AVE or SUM, etc.
+	Rollup   string  `json:"rollup,omitempty"` // Rollup used for metric calculation
+	Value    float64 `json:"value"`            // Value is expected to be in %
+}
+
+type NodeMetricsMap map[string]NodeMetrics
+
+type Data struct {
+	NodeMetricsMap NodeMetricsMap
+}
+
+type WatcherMetrics struct {
+	Timestamp int64  `json:"timestamp"`
+	Window    Window `json:"window"`
+	Source    string `json:"source"`
+	Data      Data   `json:"data"`
+}
+
+type Tags struct {
+}
+
+type Metadata struct {
+	DataCenter string `json:"dataCenter,omitempty"`
+}
+
+type NodeMetrics struct {
+	Metrics  []Metric `json:"metrics,omitempty"`
+	Tags     Tags     `json:"tags,omitempty"`
+	Metadata Metadata `json:"metadata,omitempty"`
+}
+
+// NewWatcher Returns a new initialised Watcher
+func NewWatcher(client MetricsProviderClient) *Watcher {
+	sizePerWindow := 5
+	return &Watcher{
+		mutex:         sync.RWMutex{},
+		fifteenMinute: make([]WatcherMetrics, 0, sizePerWindow),
+		tenMinute:     make([]WatcherMetrics, 0, sizePerWindow),
+		fiveMinute:    make([]WatcherMetrics, 0, sizePerWindow),
+		cacheSize:     sizePerWindow,
+		client:        client,
+		shutdown:      make(chan os.Signal, 1),
+	}
+}
+
+// StartWatching This function needs to be called to begin actual watching
+func (w *Watcher) StartWatching() {
+	w.mutex.RLock()
+	if w.isStarted {
+		w.mutex.RUnlock()
+		return
+	}
+	w.mutex.RUnlock()
+
+	fetchOnce := func(duration string) {
+		curWindow, metric := w.getCurrentWindow(duration)
+		hostMetrics, err := w.client.FetchAllHostsMetrics(curWindow)
+
+		if err != nil {
+			log.Errorf("received error while fetching metrics: %v", err)
+			return
+		}
+		log.Debugf("fetched metrics for window: %v", curWindow)
+
+		// TODO： add tags, etc.
+		watcherMetrics := metricMapToWatcherMetrics(hostMetrics, w.client.Name(), *curWindow)
+		w.appendWatcherMetrics(metric, &watcherMetrics)
+	}
+
+	windowWatcher := func(duration string) {
+		for {
+			fetchOnce(duration)
+			// This is assuming fetching of metrics won't exceed more than 1 minute. If it happens we need to throttle rate of fetches
+			time.Sleep(time.Minute)
+		}
+	}
+
+	durations := [3]string{FifteenMinutes, TenMinutes, FiveMinutes}
+	for _, duration := range durations {
+		// Populate cache initially before returning
+		fetchOnce(duration)
+		go windowWatcher(duration)
+	}
+
+	http.HandleFunc(BaseUrl, w.handler)
+	http.HandleFunc(HealthCheckUrl, w.healthCheckHandler)
+	server := &http.Server{
+		Addr:    ":2020",
+		Handler: http.DefaultServeMux,
+	}
+
+	go func() {
+		log.Warn(server.ListenAndServe())
+	}()
+
+	signal.Notify(w.shutdown, os.Interrupt, syscall.SIGTERM)
+
+	go func() {
+		<-w.shutdown
+		ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+		defer cancel()
+		if err := server.Shutdown(ctx); err != nil {
+			log.Errorf("Unable to shutdown server: %v", err)
+		}
+	}()
+
+	w.mutex.Lock()
+	w.isStarted = true
+	w.mutex.Unlock()
+	log.Info("Started watching metrics")
+}
+
+// GetLatestWatcherMetrics It starts from 15 minute window, and falls back to 10 min, 5 min windows subsequently
+// if metrics are not present. StartWatching() should be called before calling this.
+func (w *Watcher) GetLatestWatcherMetrics(duration string) (*WatcherMetrics, error) {
+	w.mutex.RLock()
+	defer w.mutex.RUnlock()
+	if !w.isStarted {
+		return nil, errors.New("need to call StartWatching() first")
+	}
+
+	switch {
+	case duration == FifteenMinutes && len(w.fifteenMinute) > 0:
+		return w.deepCopyWatcherMetrics(&w.fifteenMinute[len(w.fifteenMinute)-1]), nil
+	case (duration == FifteenMinutes || duration == TenMinutes) && len(w.tenMinute) > 0:
+		return w.deepCopyWatcherMetrics(&w.tenMinute[len(w.tenMinute)-1]), nil
+	case (duration == TenMinutes || duration == FiveMinutes) && len(w.fiveMinute) > 0:
+		return w.deepCopyWatcherMetrics(&w.fiveMinute[len(w.fiveMinute)-1]), nil
+	default:
+		return nil, errors.New("unable to get any latest metrics")
+	}
+}
+
+func (w *Watcher) getCurrentWindow(duration string) (*Window, *[]WatcherMetrics) {
+	var curWindow *Window
+	var watcherMetrics *[]WatcherMetrics
+	switch duration {
+	case FifteenMinutes:
+		curWindow = CurrentFifteenMinuteWindow()
+		watcherMetrics = &w.fifteenMinute
+	case TenMinutes:
+		curWindow = CurrentTenMinuteWindow()
+		watcherMetrics = &w.tenMinute
+	case FiveMinutes:
+		curWindow = CurrentFiveMinuteWindow()
+		watcherMetrics = &w.fiveMinute
+	default:
+		log.Error("received unexpected window duration, defaulting to 15m")
+		curWindow = CurrentFifteenMinuteWindow()
+	}
+	return curWindow, watcherMetrics
+}
+
+func (w *Watcher) appendWatcherMetrics(recentMetrics *[]WatcherMetrics, metric *WatcherMetrics) {
+	w.mutex.Lock()
+	defer w.mutex.Unlock()
+	if len(*recentMetrics) == w.cacheSize {
+		*recentMetrics = (*recentMetrics)[1:]
+	}
+	*recentMetrics = append(*recentMetrics, *metric)
+}
+
+func (w *Watcher) deepCopyWatcherMetrics(src *WatcherMetrics) *WatcherMetrics {
+	nodeMetricsMap := make(map[string]NodeMetrics)
+	for host, fetchedMetric := range src.Data.NodeMetricsMap {
+		nodeMetric := NodeMetrics{
+			Metrics: make([]Metric, len(fetchedMetric.Metrics)),
+			Tags:    fetchedMetric.Tags,
+		}
+		copy(nodeMetric.Metrics, fetchedMetric.Metrics)
+		nodeMetric.Metadata = fetchedMetric.Metadata
+		nodeMetricsMap[host] = nodeMetric
+	}
+	return &WatcherMetrics{
+		Timestamp: src.Timestamp,
+		Window:    src.Window,
+		Source:    src.Source,
+		Data: Data{
+			NodeMetricsMap: nodeMetricsMap,
+		},
+	}
+}
+
+// HTTP Handler for BaseUrl endpoint
+func (w *Watcher) handler(resp http.ResponseWriter, r *http.Request) {
+	resp.Header().Set("Content-Type", "application/json")
+
+	metrics, err := w.GetLatestWatcherMetrics(FifteenMinutes)
+	if metrics == nil {
+		if err != nil {
+			resp.WriteHeader(http.StatusInternalServerError)
+			log.Error(err)
+			return
+		}
+		resp.WriteHeader(http.StatusNotFound)
+		return
+	}
+
+	host := r.URL.Query().Get("host")
+	var bytes []byte
+	if host != "" {
+		if _, ok := metrics.Data.NodeMetricsMap[host]; ok {
+			hostMetricsData := make(map[string]NodeMetrics)
+			hostMetricsData[host] = metrics.Data.NodeMetricsMap[host]
+			hostMetrics := WatcherMetrics{Timestamp: metrics.Timestamp,
+				Window: metrics.Window,
+				Source: metrics.Source,
+				Data:   Data{NodeMetricsMap: hostMetricsData},
+			}
+			bytes, err = gojay.MarshalJSONObject(&hostMetrics)
+		} else {
+			resp.WriteHeader(http.StatusNotFound)
+			return
+		}
+	} else {
+		bytes, err = gojay.MarshalJSONObject(metrics)
+	}
+
+	if err != nil {
+		log.Error(err)
+		resp.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	_, err = resp.Write(bytes)
+	if err != nil {
+		log.Error(err)
+		resp.WriteHeader(http.StatusInternalServerError)
+	}
+}
+
+// Simple server status handler
+func (w *Watcher) healthCheckHandler(resp http.ResponseWriter, r *http.Request) {
+	if status, err := w.client.Health(); status != 0 {
+		log.Warnf("health check failed with: %v", err)
+		resp.WriteHeader(http.StatusServiceUnavailable)
+		return
+	}
+	resp.WriteHeader(http.StatusOK)
+}
+
+// Utility functions
+
+func metricMapToWatcherMetrics(metricMap map[string][]Metric, clientName string, window Window) WatcherMetrics {
+	metricsMap := make(map[string]NodeMetrics)
+	for host, metricList := range metricMap {
+		nodeMetric := NodeMetrics{
+			Metrics: make([]Metric, len(metricList)),
+		}
+		copy(nodeMetric.Metrics, metricList)
+		metricsMap[host] = nodeMetric
+	}
+
+	watcherMetrics := WatcherMetrics{Timestamp: time.Now().Unix(),
+		Data:   Data{NodeMetricsMap: metricsMap},
+		Source: clientName,
+		Window: window,
+	}
+	return watcherMetrics
+}
+
+func CurrentFifteenMinuteWindow() *Window {
+	curTime := time.Now().Unix()
+	return &Window{FifteenMinutes, curTime - 15*60, curTime}
+}
+
+func CurrentTenMinuteWindow() *Window {
+	curTime := time.Now().Unix()
+	return &Window{TenMinutes, curTime - 10*60, curTime}
+}
+
+func CurrentFiveMinuteWindow() *Window {
+	curTime := time.Now().Unix()
+	return &Window{FiveMinutes, curTime - 5*60, curTime}
+}
--- a/3rd/load-watcher/pkg/watcher/watcher_json.go
+++ b/3rd/load-watcher/pkg/watcher/watcher_json.go
@ -0,0 +1,293 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Generated from gojay generator tool, with some bug fixes
+
+package watcher
+
+import (
+	"github.com/francoispqt/gojay"
+)
+
+type Metrices []Metric
+
+func (s *Metrices) UnmarshalJSONArray(dec *gojay.Decoder) error {
+	var value = Metric{}
+	if err := dec.Object(&value); err != nil {
+		return err
+	}
+	*s = append(*s, value)
+	return nil
+}
+
+func (s Metrices) MarshalJSONArray(enc *gojay.Encoder) {
+	for i := range s {
+		enc.Object(&s[i])
+	}
+}
+
+func (s Metrices) IsNil() bool {
+	return len(s) == 0
+}
+
+// MarshalJSONObject implements MarshalerJSONObject
+func (d *Data) MarshalJSONObject(enc *gojay.Encoder) {
+	enc.ObjectKey("NodeMetricsMap", &d.NodeMetricsMap)
+}
+
+// IsNil checks if instance is nil
+func (d *Data) IsNil() bool {
+	return d == nil
+}
+
+// UnmarshalJSONObject implements gojay's UnmarshalerJSONObject
+func (d *Data) UnmarshalJSONObject(dec *gojay.Decoder, k string) error {
+
+	switch k {
+	case "NodeMetricsMap":
+		err := dec.Object(&d.NodeMetricsMap)
+		return err
+	}
+	return nil
+}
+
+// NKeys returns the number of keys to unmarshal
+func (d *Data) NKeys() int { return 1 }
+
+// MarshalJSONObject implements MarshalerJSONObject
+func (m *Metadata) MarshalJSONObject(enc *gojay.Encoder) {
+	enc.StringKey("dataCenter", m.DataCenter)
+}
+
+// IsNil checks if instance is nil
+func (m *Metadata) IsNil() bool {
+	return m == nil
+}
+
+// UnmarshalJSONObject implements gojay's UnmarshalerJSONObject
+func (m *Metadata) UnmarshalJSONObject(dec *gojay.Decoder, k string) error {
+
+	switch k {
+	case "dataCenter":
+		return dec.String(&m.DataCenter)
+
+	}
+	return nil
+}
+
+// NKeys returns the number of keys to unmarshal
+func (m *Metadata) NKeys() int { return 1 }
+
+// MarshalJSONObject implements MarshalerJSONObject
+func (m *Metric) MarshalJSONObject(enc *gojay.Encoder) {
+	enc.StringKey("name", m.Name)
+	enc.StringKey("type", m.Type)
+	enc.StringKey("operator", m.Operator)
+	enc.StringKey("rollup", m.Rollup)
+	enc.Float64Key("value", m.Value)
+}
+
+// IsNil checks if instance is nil
+func (m *Metric) IsNil() bool {
+	return m == nil
+}
+
+// UnmarshalJSONObject implements gojay's UnmarshalerJSONObject
+func (m *Metric) UnmarshalJSONObject(dec *gojay.Decoder, k string) error {
+
+	switch k {
+	case "name":
+		return dec.String(&m.Name)
+
+	case "type":
+		return dec.String(&m.Type)
+
+	case "operator":
+		return dec.String(&m.Operator)
+
+	case "rollup":
+		return dec.String(&m.Rollup)
+
+	case "value":
+		return dec.Float64(&m.Value)
+
+	}
+	return nil
+}
+
+// NKeys returns the number of keys to unmarshal
+func (m *Metric) NKeys() int { return 5 }
+
+// MarshalJSONObject implements MarshalerJSONObject
+func (m *NodeMetrics) MarshalJSONObject(enc *gojay.Encoder) {
+	var metricsSlice = Metrices(m.Metrics)
+	enc.ArrayKey("metrics", metricsSlice)
+	enc.ObjectKey("tags", &m.Tags)
+	enc.ObjectKey("metadata", &m.Metadata)
+}
+
+// IsNil checks if instance is nil
+func (m *NodeMetrics) IsNil() bool {
+	return m == nil
+}
+
+// UnmarshalJSONObject implements gojay's UnmarshalerJSONObject
+func (m *NodeMetrics) UnmarshalJSONObject(dec *gojay.Decoder, k string) error {
+
+	switch k {
+	case "metrics":
+		var aSlice = Metrices{}
+		err := dec.Array(&aSlice)
+		if err == nil && len(aSlice) > 0 {
+			m.Metrics = []Metric(aSlice)
+		}
+		return err
+
+	case "tags":
+		err := dec.Object(&m.Tags)
+
+		return err
+
+	case "metadata":
+		err := dec.Object(&m.Metadata)
+
+		return err
+
+	}
+	return nil
+}
+
+// NKeys returns the number of keys to unmarshal
+func (m *NodeMetrics) NKeys() int { return 3 }
+
+// MarshalJSONObject implements MarshalerJSONObject
+func (m *NodeMetricsMap) MarshalJSONObject(enc *gojay.Encoder) {
+	for k, v := range *m {
+		enc.ObjectKey(k, &v)
+	}
+}
+
+// IsNil checks if instance is nil
+func (m *NodeMetricsMap) IsNil() bool {
+	return m == nil
+}
+
+// UnmarshalJSONObject implements gojay's UnmarshalerJSONObject
+func (m *NodeMetricsMap) UnmarshalJSONObject(dec *gojay.Decoder, k string) error {
+	var value NodeMetrics
+	if err := dec.Object(&value); err != nil {
+		return err
+	}
+	(*m)[k] = value
+	return nil
+}
+
+// NKeys returns the number of keys to unmarshal
+func (m *NodeMetricsMap) NKeys() int { return 0 }
+
+// MarshalJSONObject implements MarshalerJSONObject
+func (t *Tags) MarshalJSONObject(enc *gojay.Encoder) {
+
+}
+
+// IsNil checks if instance is nil
+func (t *Tags) IsNil() bool {
+	return t == nil
+}
+
+// UnmarshalJSONObject implements gojay's UnmarshalerJSONObject
+func (t *Tags) UnmarshalJSONObject(dec *gojay.Decoder, k string) error {
+
+	switch k {
+
+	}
+	return nil
+}
+
+// NKeys returns the number of keys to unmarshal
+func (t *Tags) NKeys() int { return 0 }
+
+// MarshalJSONObject implements MarshalerJSONObject
+func (m *WatcherMetrics) MarshalJSONObject(enc *gojay.Encoder) {
+	enc.Int64Key("timestamp", m.Timestamp)
+	enc.ObjectKey("window", &m.Window)
+	enc.StringKey("source", m.Source)
+	enc.ObjectKey("data", &m.Data)
+}
+
+// IsNil checks if instance is nil
+func (m *WatcherMetrics) IsNil() bool {
+	return m == nil
+}
+
+// UnmarshalJSONObject implements gojay's UnmarshalerJSONObject
+func (m *WatcherMetrics) UnmarshalJSONObject(dec *gojay.Decoder, k string) error {
+
+	switch k {
+	case "timestamp":
+		return dec.Int64(&m.Timestamp)
+
+	case "window":
+		err := dec.Object(&m.Window)
+
+		return err
+
+	case "source":
+		return dec.String(&m.Source)
+
+	case "data":
+		err := dec.Object(&m.Data)
+
+		return err
+
+	}
+	return nil
+}
+
+// NKeys returns the number of keys to unmarshal
+func (m *WatcherMetrics) NKeys() int { return 4 }
+
+// MarshalJSONObject implements MarshalerJSONObject
+func (w *Window) MarshalJSONObject(enc *gojay.Encoder) {
+	enc.StringKey("duration", w.Duration)
+	enc.Int64Key("start", w.Start)
+	enc.Int64Key("end", w.End)
+}
+
+// IsNil checks if instance is nil
+func (w *Window) IsNil() bool {
+	return w == nil
+}
+
+// UnmarshalJSONObject implements gojay's UnmarshalerJSONObject
+func (w *Window) UnmarshalJSONObject(dec *gojay.Decoder, k string) error {
+
+	switch k {
+	case "duration":
+		return dec.String(&w.Duration)
+
+	case "start":
+		return dec.Int64(&w.Start)
+
+	case "end":
+		return dec.Int64(&w.End)
+
+	}
+	return nil
+}
+
+// NKeys returns the number of keys to unmarshal
+func (w *Window) NKeys() int { return 3 }
--- a/3rd/load-watcher/pkg/watcher/watcher_test.go
+++ b/3rd/load-watcher/pkg/watcher/watcher_test.go
@ -0,0 +1,141 @@
+/*
+Copyright 2020 PayPal
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package watcher
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"os"
+	"testing"
+
+	"github.com/francoispqt/gojay"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+var w *Watcher
+
+func TestGetLatestWatcherMetrics(t *testing.T) {
+	var metrics *WatcherMetrics
+	metrics, err := w.GetLatestWatcherMetrics(FifteenMinutes)
+	require.Nil(t, err)
+	assert.Equal(t, FifteenMinutesMetricsMap[FirstNode], metrics.Data.NodeMetricsMap[FirstNode].Metrics)
+	assert.Equal(t, FifteenMinutesMetricsMap[SecondNode], metrics.Data.NodeMetricsMap[SecondNode].Metrics)
+
+	metrics, err = w.GetLatestWatcherMetrics(TenMinutes)
+	require.Nil(t, err)
+	assert.Equal(t, TenMinutesMetricsMap[FirstNode], metrics.Data.NodeMetricsMap[FirstNode].Metrics)
+	assert.Equal(t, TenMinutesMetricsMap[SecondNode], metrics.Data.NodeMetricsMap[SecondNode].Metrics)
+
+	metrics, err = w.GetLatestWatcherMetrics(FiveMinutes)
+	require.Nil(t, err)
+	assert.Equal(t, FiveMinutesMetricsMap[FirstNode], metrics.Data.NodeMetricsMap[FirstNode].Metrics)
+	assert.Equal(t, FiveMinutesMetricsMap[SecondNode], metrics.Data.NodeMetricsMap[SecondNode].Metrics)
+}
+
+func TestWatcherAPIAllHosts(t *testing.T) {
+	req, err := http.NewRequest("GET", BaseUrl, nil)
+	require.Nil(t, err)
+
+	rr := httptest.NewRecorder()
+	handler := http.HandlerFunc(w.handler)
+
+	handler.ServeHTTP(rr, req)
+	require.Equal(t, http.StatusOK, rr.Code)
+
+	expectedMetrics, err := w.GetLatestWatcherMetrics(FifteenMinutes)
+	require.Nil(t, err)
+	data := Data{NodeMetricsMap: make(map[string]NodeMetrics)}
+	var watcherMetrics = &WatcherMetrics{Data: data}
+	err = gojay.UnmarshalJSONObject(rr.Body.Bytes(), watcherMetrics)
+	require.Nil(t, err)
+	assert.Equal(t, expectedMetrics, watcherMetrics)
+}
+
+func TestWatcherAPISingleHost(t *testing.T) {
+	uri, _ := url.Parse(BaseUrl)
+	q := uri.Query()
+	q.Set("host", FirstNode)
+	uri.RawQuery = q.Encode()
+	req, err := http.NewRequest("GET", uri.String(), nil)
+	require.Nil(t, err)
+
+	rr := httptest.NewRecorder()
+	handler := http.HandlerFunc(w.handler)
+
+	handler.ServeHTTP(rr, req)
+	require.Equal(t, http.StatusOK, rr.Code)
+
+	expectedMetrics, err := w.GetLatestWatcherMetrics(FifteenMinutes)
+	require.Nil(t, err)
+	data := Data{NodeMetricsMap: make(map[string]NodeMetrics)}
+	var watcherMetrics = &WatcherMetrics{Data: data}
+	err = gojay.UnmarshalJSONObject(rr.Body.Bytes(), watcherMetrics)
+	require.Nil(t, err)
+	assert.Equal(t, expectedMetrics.Data.NodeMetricsMap[FirstNode], watcherMetrics.Data.NodeMetricsMap[FirstNode])
+	assert.Equal(t, expectedMetrics.Source, watcherMetrics.Source)
+}
+
+func TestWatcherMetricsNotFound(t *testing.T) {
+	uri, _ := url.Parse(BaseUrl)
+	q := uri.Query()
+	q.Set("host", "deadbeef")
+	uri.RawQuery = q.Encode()
+	req, err := http.NewRequest("GET", uri.String(), nil)
+	require.Nil(t, err)
+
+	rr := httptest.NewRecorder()
+	handler := http.HandlerFunc(w.handler)
+
+	handler.ServeHTTP(rr, req)
+	assert.Equal(t, http.StatusNotFound, rr.Code)
+}
+
+func TestWatcherInternalServerError(t *testing.T) {
+	client := NewTestMetricsServerClient()
+	unstartedWatcher := NewWatcher(client)
+
+	req, err := http.NewRequest("GET", BaseUrl, nil)
+	require.Nil(t, err)
+
+	rr := httptest.NewRecorder()
+	handler := http.HandlerFunc(unstartedWatcher.handler)
+
+	handler.ServeHTTP(rr, req)
+	assert.Equal(t, http.StatusInternalServerError, rr.Code)
+}
+
+func TestWatcherHealthCheck(t *testing.T) {
+	req, err := http.NewRequest("GET", HealthCheckUrl, nil)
+	require.Nil(t, err)
+
+	rr := httptest.NewRecorder()
+	handler := http.HandlerFunc(w.handler)
+
+	handler.ServeHTTP(rr, req)
+	require.Equal(t, http.StatusOK, rr.Code)
+}
+
+func TestMain(m *testing.M) {
+	client := NewTestMetricsServerClient()
+	w = NewWatcher(client)
+	w.StartWatching()
+
+	ret := m.Run()
+	os.Exit(ret)
+}