Add initial version of the opentelemetry-collector chart (#2)

The change was initially submitted and pre-reviewed in contrib repo: open-telemetry/opentelemetry-collector-contrib#1026

charts/opentelemetry-collector/.helmignore

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+# 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
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

charts/opentelemetry-collector/Chart.yaml

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+apiVersion: v2
+name: opentelemetry-collector
+version: 0.1.0
+description: OpenTelemetry Collector Helm chart for Kubernetes
+type: application
+home: https://opentelemetry.io/
+sources:
+  - https://github.com/open-telemetry/opentelemetry-collector
+  - https://github.com/open-telemetry/opentelemetry-collector-contrib
+maintainers:
+  - name: bogdandrutu
+  - name: dmitryax
+  - name: pjanotti
+  - name: tigrannajaryan
+icon: https://opentelemetry.io/img/logos/opentelemetry-logo-nav.png
+appVersion: 0.11.0

charts/opentelemetry-collector/README.md

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+# OpenTelemetry Collector Helm Chart
+
+The helm chart installs [OpenTelemetry Collector](https://github.com/open-telemetry/opentelemetry-collector)
+in kubernetes cluster.
+
+## Prerequisites
+
+- Helm 3.0+
+
+## Installing the Chart
+
+Add OpenTelemetry Helm repository:
+
+```console
+helm repo add open-telemetry https://open-telemetry.github.io/opentelemetry-helm-charts
+```
+
+To install the chart with the release name my-opentelemetry-collector, run the following command:
+
+```console
+helm install my-opentelemetry-collector open-telemetry/opentelemetry-collector
+```
+
+## Configuration
+
+### Default configuration
+
+By default this chart will deploy an OpenTelemetry Collector as daemonset with two pipelines (traces and metrics)
+and logging exporter enabled by default. Besides daemonset (agent), it can be also installed as standalone deployment.
+Both modes can be enabled together, in that case metrics and traces will be flowing from agents to standalone collectors.
+
+*Example*: Install collector as a standalone deployment, and do not run it as an agent.
+```yaml
+agentCollector:
+  enabled: false
+standaloneCollector:
+  enabled: true
+```
+
+By default collector has the following receivers enabled:
+- **metrics**: OTLP and prometheus. Prometheus is configured only for scraping collector's own metrics.
+- **traces**: OTLP, zipkin and jaeger (thrift and grpc).
+
+There are two ways to configure collector pipelines, which can be used together as well.
+
+### Basic top level configuration with `telemetry` property
+
+*Example*: Disable metrics pipeline and send traces to zipkin exporter:
+```yaml
+telemetry:
+  metrics:
+    enabled: false
+  traces:
+    exporter:
+      type: zipkin
+      config:
+        endpoint: zipkin-all-in-one:14250
+```
+
+### Configuration with `agentCollector` and `standaloneCollector` properties
+
+`agentCollector` and `standaloneCollector` properties allow to override collector configurations
+and default parameters applied on the k8s pods.
+
+`agentCollector(standaloneCollector).configOverride` property allows to provide an extra
+configuration that will be merged into the default configuration.
+
+*Example*: Enable host metrics receiver on the agents:
+```yaml
+agentCollector:
+  configOverride:
+    receivers:
+      hostmetrics:
+        scrapers:
+          cpu:
+          load:
+          memory:
+          disk:
+    service:
+      pipelines:
+        metrics:
+          receivers: [prometheus, hostmetrics]
+  extraEnvs:
+  - name: HOST_PROC
+    value: /hostfs/proc
+  - name: HOST_SYS
+    value: /hostfs/sys
+  - name: HOST_ETC
+    value: /hostfs/etc
+  - name: HOST_VAR
+    value: /hostfs/var
+  - name: HOST_RUN
+    value: /hostfs/run
+  - name: HOST_DEV
+    value: /hostfs/dev
+  extraHostPathMounts:
+  - name: hostfs
+    hostPath: /
+    mountPath: /hostfs
+    readOnly: true
+    mountPropagation: HostToContainer
+```
+
+### Other configuration options
+
+The [values.yaml](./values.yaml) file contains information about all other configuration
+options for this chart.

charts/opentelemetry-collector/templates/_helpers.tpl

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+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "opentelemetry-collector.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).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "opentelemetry-collector.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "opentelemetry-collector.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "opentelemetry-collector.labels" -}}
+helm.sh/chart: {{ include "opentelemetry-collector.chart" . }}
+{{ include "opentelemetry-collector.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "opentelemetry-collector.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "opentelemetry-collector.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "opentelemetry-collector.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "opentelemetry-collector.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
+
+{{/*
+Build base config file with pipelines
+*/}}
+{{- define "opentelemetry-collector.pipelinesConfig" -}}
+{{- $config := include "opentelemetry-collector.baseConfig" . | fromYaml -}}
+{{- range $telemetryName, $telemetryParams := .Values.telemetry }}
+  {{- if index $telemetryParams "enabled" }}
+    {{- $config := include (printf "opentelemetry-collector.%sPipelineConfig" $telemetryName) $ | fromYaml | mustMergeOverwrite $config }}
+  {{- end }}
+{{- end }}
+{{- $config | toYaml }}
+{{- end }}
+
+{{/*
+Build config file for agent OpenTelemetry Collector
+*/}}
+{{- define "opentelemetry-collector.agentCollectorConfig" -}}
+{{- $values := deepCopy .Values.agentCollector | mustMergeOverwrite (deepCopy .Values)  }}
+{{- $data := dict "Values" $values | mustMergeOverwrite (deepCopy .) }}
+{{- $config := include "opentelemetry-collector.pipelinesConfig" $data | fromYaml }}
+{{- $config := include "opentelemetry-collector.agentConfigOverride" $data | fromYaml | mustMergeOverwrite $config }}
+{{- .Values.agentCollector.configOverride | mustMergeOverwrite $config | toYaml }}
+{{- end }}
+
+{{/*
+Build config file for standalone OpenTelemetry Collector
+*/}}
+{{- define "opentelemetry-collector.standaloneCollectorConfig" -}}
+{{- $values := deepCopy .Values.standaloneCollector | mustMergeOverwrite (deepCopy .Values)  }}
+{{- $data := dict "Values" $values | mustMergeOverwrite (deepCopy .) }}
+{{- $config := include "opentelemetry-collector.pipelinesConfig" $data | fromYaml }}
+{{- .Values.standaloneCollector.configOverride | mustMergeOverwrite $config | toYaml }}
+{{- end }}
+
+{{/*
+Convert memory value from resources.limit to numeric value in MiB to be used by otel memory_limiter processor.
+*/}}
+{{- define "opentelemetry-collector.convertMemToMib" -}}
+{{- $mem := lower . -}}
+{{- if hasSuffix "e" $mem -}}
+{{- trimSuffix "e" $mem | atoi | mul 1000 | mul 1000 | mul 1000 | mul 1000 -}}
+{{- else if hasSuffix "ei" $mem -}}
+{{- trimSuffix "ei" $mem | atoi | mul 1024 | mul 1024 | mul 1024 | mul 1024 -}}
+{{- else if hasSuffix "p" $mem -}}
+{{- trimSuffix "p" $mem | atoi | mul 1000 | mul 1000 | mul 1000 -}}
+{{- else if hasSuffix "pi" $mem -}}
+{{- trimSuffix "pi" $mem | atoi | mul 1024 | mul 1024 | mul 1024 -}}
+{{- else if hasSuffix "t" $mem -}}
+{{- trimSuffix "t" $mem | atoi | mul 1000 | mul 1000 -}}
+{{- else if hasSuffix "ti" $mem -}}
+{{- trimSuffix "ti" $mem | atoi | mul 1024 | mul 1024 -}}
+{{- else if hasSuffix "g" $mem -}}
+{{- trimSuffix "g" $mem | atoi | mul 1000 -}}
+{{- else if hasSuffix "gi" $mem -}}
+{{- trimSuffix "gi" $mem | atoi | mul 1024 -}}
+{{- else if hasSuffix "m" $mem -}}
+{{- div (trimSuffix "m" $mem | atoi | mul 1000) 1024 -}}
+{{- else if hasSuffix "mi" $mem -}}
+{{- trimSuffix "mi" $mem | atoi -}}
+{{- else if hasSuffix "k" $mem -}}
+{{- div (trimSuffix "k" $mem | atoi) 1000 -}}
+{{- else if hasSuffix "ki" $mem -}}
+{{- div (trimSuffix "ki" $mem | atoi) 1024 -}}
+{{- else -}}
+{{- div (div ($mem | atoi) 1024) 1024 -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Get otel memory_limiter limit_mib value based on 80% of resources.memory.limit.
+*/}}
+{{- define "opentelemetry-collector.getMemLimitMib" -}}
+{{- div (mul (include "opentelemetry-collector.convertMemToMib" .) 80) 100 }}
+{{- end -}}
+
+{{/*
+Get otel memory_limiter spike_limit_mib value based on 25% of resources.memory.limit.
+*/}}
+{{- define "opentelemetry-collector.getMemSpikeLimitMib" -}}
+{{- div (mul (include "opentelemetry-collector.convertMemToMib" .) 25) 100 }}
+{{- end -}}
+
+{{/*
+Get otel memory_limiter ballast_size_mib value based on 40% of resources.memory.limit.
+*/}}
+{{- define "opentelemetry-collector.getMemBallastSizeMib" }}
+{{- div (mul (include "opentelemetry-collector.convertMemToMib" .) 40) 100 }}
+{{- end -}}

charts/opentelemetry-collector/templates/_pod.tpl

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+{{- define "opentelemetry-collector.pod" -}}
+{{- with .Values.imagePullSecrets }}
+imagePullSecrets:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+serviceAccountName: {{ include "opentelemetry-collector.serviceAccountName" . }}
+securityContext:
+  {{- toYaml .Values.podSecurityContext | nindent 2 }}
+containers:
+  - name: {{ .Chart.Name }}
+    command:
+      - /{{ .Values.command.name }}
+      - --config=/conf/relay.yaml
+      - --metrics-addr=0.0.0.0:8888
+      - --mem-ballast-size-mib={{ template "opentelemetry-collector.getMemBallastSizeMib" .Values.resources.limits.memory }}
+      {{- range .Values.command.extraArgs }}
+      - {{ . }}
+      {{- end }}
+    securityContext:
+      {{- toYaml .Values.securityContext | nindent 6 }}
+    image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+    imagePullPolicy: {{ .Values.image.pullPolicy }}
+    ports:
+      {{- range $key, $port := .Values.ports }}
+      {{- if $port.enabled }}
+      - name: {{ $key }}
+        containerPort: {{ $port.containerPort }}
+        protocol: {{ $port.protocol }}
+        {{- if and $.isAgent $port.hostPort }}
+        hostPort: {{ $port.hostPort }}
+        {{- end }}
+      {{- end }}
+      {{- end }}
+    env:
+      - name: MY_POD_IP
+        valueFrom:
+          fieldRef:
+            apiVersion: v1
+            fieldPath: status.podIP
+      {{- with .Values.extraEnvs }}
+      {{- . | toYaml | nindent 6 }}
+      {{- end }}
+    livenessProbe:
+      httpGet:
+        path: /
+        port: 13133
+    readinessProbe:
+      httpGet:
+        path: /
+        port: 13133
+    resources:
+      {{- toYaml .Values.resources | nindent 6 }}
+    volumeMounts:
+      - mountPath: /conf
+        name: {{ .Chart.Name }}-configmap
+      {{- range .Values.extraHostPathMounts }}
+      - name: {{ .name }}
+        mountPath: {{ .mountPath }}
+        readOnly: {{ .readOnly }}
+        {{- if .mountPropagation }}
+        mountPropagation: {{ .mountPropagation }}
+        {{- end }}
+      {{- end }}
+volumes:
+  - name: {{ .Chart.Name }}-configmap
+    configMap:
+      name: {{ include "opentelemetry-collector.fullname" . }}{{ .configmapSuffix }}
+      items:
+        - key: relay
+          path: relay.yaml
+  {{- range .Values.extraHostPathMounts }}
+  - name: {{ .name }}
+    hostPath:
+      path: {{ .hostPath }}
+  {{- end }}
+{{- with .Values.nodeSelector }}
+nodeSelector:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+{{- with .Values.affinity }}
+affinity:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+{{- with .Values.tolerations }}
+tolerations:
+  {{- toYaml . | nindent 2 }}
+{{- end }}
+{{- end }}