Adding prometheus-to-sd chart (#2363)

* Adding prometheus-to-sd chart

* Updated description

* #1785 namespace defined templates with chart name

* updating Chart.yaml

* aligned the parameters table

* do not limit resources by default and allow the user adjust as needed

* Making the linter happy

* use {{ .Release.Name }} for resource naming

* Revert "use {{ .Release.Name }} for resource naming"

This reverts commit 518ad934b66ec2f39218615539d8fb41bb8e23d5.

* fullname to match .Release.Name

* updated apiVersion for deployment resource

* github username

* Adding nodeSelector default value and docs

stable/prometheus-to-sd/.helmignore

@@ -0,0 +1,21 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj

stable/prometheus-to-sd/Chart.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+appVersion: 0.2.2
+description: Scrape metrics stored in prometheus format and push them to the Stackdriver
+home: https://github.com/GoogleCloudPlatform/k8s-stackdriver/tree/master/prometheus-to-sd
+keywords:
+- prometheus
+- stackdriver
+maintainers:
+- name: acondrat
+  email: arcadie.condrat@gmail.com
+name: prometheus-to-sd
+version: 0.1.0

stable/prometheus-to-sd/README.md

@@ -0,0 +1,67 @@
+# prometheus-to-sd
+
+[prometheus-to-sd](https://github.com/GoogleCloudPlatform/k8s-stackdriver/tree/master/prometheus-to-sd) is a simple component that can scrape metrics stored in prometheus text format from one or multiple components and push them to the Stackdriver
+
+## TL;DR;
+
+```bash
+$ helm install stable/prometheus-to-sd
+```
+
+
+## Prerequisites
+
+- a service exposing metrics in prometheus format
+- k8s cluster should run on GCE or GKE
+
+## Installing the Chart
+
+To install the chart with the release name `my-release`:
+
+```bash
+$ helm install --name my-release stable/prometheus-to-sd
+```
+
+The command deploys prometheus-to-sd on the Kubernetes cluster in the default configuration.
+
+## Uninstalling the Chart
+
+To uninstall/delete the `my-release` deployment:
+
+```bash
+$ helm delete my-release
+```
+
+The command removes all the Kubernetes components associated with the chart and deletes the release.
+
+## Configuration
+
+The following tables lists the configurable parameters and their default values.
+
+| Parameter          | Description                                                                               | Default                                     |
+| ------------------ | ----------------------------------------------------------------------------------------- | ------------------------------------------- |
+| `image.repository` | prometheus-to-sd image repository                                                         | `gcr.io/google-containers/prometheus-to-sd` |
+| `image.tag`        | prometheus-to-sd image tag                                                                | `v0.2.2`                                    |
+| `image.pullPolicy` | Image pull policy                                                                         | `IfNotPresent`                              |
+| `resources`        | CPU/Memory resource requests/limits                                                       | `{}`                                        |
+| `port`             | Profiler port                                                                             | `6060`                                      |
+| `metricSources`    | Sources for metrics in the next format: component-name:http://host:port?whitelisted=a,b,c | `{}`                                        |
+| `nodeSelector`     | node labels for pod assignment                                                            | `{}`                                        |
+
+For more information please refer to the [prometheus-to-sd](https://github.com/GoogleCloudPlatform/k8s-stackdriver/tree/master/prometheus-to-sd) documentation.
+
+Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,
+
+```bash
+$ helm install --name my-release \
+  --set "metricsSources.kube-state-metrics=http://kube-state-metrics:8080" \
+    stable/prometheus-to-sd
+```
+
+Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,
+
+```bash
+$ helm install --name my-release -f values.yaml stable/prometheus-to-sd
+```
+
+Multiple metrics sources can be defined.

stable/prometheus-to-sd/templates/NOTES.txt

@@ -0,0 +1,2 @@
+Check prometheus-to-sd pod
+  $ kubectl get pods --namespace={{ .Release.Namespace }}

stable/prometheus-to-sd/templates/_helpers.tpl

@@ -0,0 +1,15 @@
+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "prometheus-to-sd.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+*/}}
+{{- define "prometheus-to-sd.fullname" -}}
+{{- printf "%s" .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}

stable/prometheus-to-sd/templates/deployment.yaml

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+apiVersion: apps/v1beta1
+kind: Deployment
+metadata:
+  name: {{ template "prometheus-to-sd.fullname" . }}
+  labels:
+    app: {{ template "prometheus-to-sd.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  template:
+    metadata:
+      labels:
+        app: {{ template "prometheus-to-sd.name" . }}
+        release: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - name: profiler
+              containerPort: {{ .Values.port }}
+          command:
+            - /monitor
+            - --stackdriver-prefix=custom.googleapis.com
+            {{- range $key, $value := .Values.metricsSources }}
+            - --source={{ $key }}:{{ $value }}
+            {{- end }}
+          resources:
+{{ toYaml .Values.resources | indent 12 }}
+    {{- if .Values.nodeSelector }}
+      nodeSelector:
+{{ toYaml .Values.nodeSelector | indent 8 }}
+    {{- end }}

stable/prometheus-to-sd/values.yaml

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+replicaCount: 1
+image:
+  repository: gcr.io/google-containers/prometheus-to-sd
+  tag: v0.2.2
+  pullPolicy: IfNotPresent
+resources: {}
+port: 6060
+metricsSources: {}
+nodeSelector: {}