[alertmanager] customize to support to use global.imageRegistry and global.nodeSelector

charts/alertmanager/.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/
+
+unittests/

charts/alertmanager/Chart.yaml

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+apiVersion: v2
+name: alertmanager
+description: The Alertmanager handles alerts sent by client applications such as the Prometheus server.
+home: https://prometheus.io/
+icon: https://raw.githubusercontent.com/prometheus/prometheus.github.io/master/assets/prometheus_logo-cb55bb5c346.png
+sources:
+  - https://github.com/prometheus/alertmanager
+type: application
+version: 1.8.1
+appVersion: v0.26.0
+kubeVersion: ">=1.19.0-0"
+keywords:
+  - monitoring
+maintainers:
+  - name: monotek
+    email: [email protected]
+  - name: naseemkullah
+    email: [email protected]
+annotations:
+  "artifacthub.io/license": Apache-2.0
+  "artifacthub.io/links": |
+    - name: Chart Source
+      url: https://github.com/prometheus-community/helm-charts

charts/alertmanager/README.md

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+# Alertmanager
+
+As per [prometheus.io documentation](https://prometheus.io/docs/alerting/latest/alertmanager/):
+> The Alertmanager handles alerts sent by client applications such as the
+> Prometheus server. It takes care of deduplicating, grouping, and routing them
+> to the correct receiver integration such as email, PagerDuty, or OpsGenie. It
+> also takes care of silencing and inhibition of alerts.
+
+## Prerequisites
+
+Kubernetes 1.14+
+
+## Get Repository Info
+
+```console
+helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
+helm repo update
+```
+
+_See [`helm repo`](https://helm.sh/docs/helm/helm_repo/) for command documentation._
+
+## Install Chart
+
+```console
+helm install [RELEASE_NAME] prometheus-community/alertmanager
+```
+
+_See [configuration](#configuration) below._
+
+_See [helm install](https://helm.sh/docs/helm/helm_install/) for command documentation._
+
+## Uninstall Chart
+
+```console
+helm uninstall [RELEASE_NAME]
+```
+
+This removes all the Kubernetes components associated with the chart and deletes the release.
+
+_See [helm uninstall](https://helm.sh/docs/helm/helm_uninstall/) for command documentation._
+
+## Upgrading Chart
+
+```console
+helm upgrade [RELEASE_NAME] [CHART] --install
+```
+
+_See [helm upgrade](https://helm.sh/docs/helm/helm_upgrade/) for command documentation._
+
+### To 1.0
+
+The [configmap-reload](https://github.com/jimmidyson/configmap-reload) container was replaced by the [prometheus-config-reloader](https://github.com/prometheus-operator/prometheus-operator/tree/main/cmd/prometheus-config-reloader).
+Extra command-line arguments specified via configmapReload.prometheus.extraArgs are not compatible and will break with the new prometheus-config-reloader, refer to the [sources](https://github.com/prometheus-operator/prometheus-operator/blob/main/cmd/prometheus-config-reloader/main.go) in order to make the appropriate adjustment to the extea command-line arguments.
+The `networking.k8s.io/v1beta1` is no longer supported. use [`networking.k8s.io/v1`](https://kubernetes.io/docs/reference/using-api/deprecation-guide/#ingressclass-v122).
+
+## Configuration
+
+See [Customizing the Chart Before Installing](https://helm.sh/docs/intro/using_helm/#customizing-the-chart-before-installing). To see all configurable options with detailed comments, visit the chart's [values.yaml](./values.yaml), or run these configuration commands:
+
+```console
+helm show values prometheus-community/alertmanager
+```

charts/alertmanager/ci/config-reload-values.yaml

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+configmapReload:
+  enabled: true

charts/alertmanager/templates/NOTES.txt

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+1. Get the application URL by running these commands:
+{{- if .Values.ingress.enabled }}
+{{- range $host := .Values.ingress.hosts }}
+  {{- range .paths }}
+  http{{ if $.Values.ingress.tls }}s{{ end }}://{{ $host.host }}{{ .path }}
+  {{- end }}
+{{- end }}
+{{- else if contains "NodePort" .Values.service.type }}
+  export NODE_PORT=$(kubectl get --namespace {{ include "alertmanager.namespace" . }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "alertmanager.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ include "alertmanager.namespace" . }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ include "alertmanager.namespace" . }} svc -w {{ include "alertmanager.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ include "alertmanager.namespace" . }} {{ include "alertmanager.fullname" . }} --template "{{"{{ range (index .status.loadBalancer.ingress 0) }}{{.}}{{ end }}"}}")
+  echo http://$SERVICE_IP:{{ .Values.service.port }}
+{{- else if contains "ClusterIP" .Values.service.type }}
+  export POD_NAME=$(kubectl get pods --namespace {{ include "alertmanager.namespace" . }} -l "app.kubernetes.io/name={{ include "alertmanager.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  echo "Visit http://127.0.0.1:{{ .Values.service.port }} to use your application"
+  kubectl --namespace {{ include "alertmanager.namespace" . }} port-forward $POD_NAME {{ .Values.service.port }}:80
+{{- end }}

charts/alertmanager/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "alertmanager.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 "alertmanager.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 "alertmanager.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "alertmanager.labels" -}}
+helm.sh/chart: {{ include "alertmanager.chart" . }}
+{{ include "alertmanager.selectorLabels" . }}
+{{- with .Chart.AppVersion }}
+app.kubernetes.io/version: {{ . | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "alertmanager.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "alertmanager.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "alertmanager.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "alertmanager.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
+
+{{/*
+Define Ingress apiVersion
+*/}}
+{{- define "alertmanager.ingress.apiVersion" -}}
+{{- printf "networking.k8s.io/v1" }}
+{{- end }}
+
+{{/*
+Define Pdb apiVersion
+*/}}
+{{- define "alertmanager.pdb.apiVersion" -}}
+{{- if $.Capabilities.APIVersions.Has "policy/v1/PodDisruptionBudget" }}
+{{- printf "policy/v1" }}
+{{- else }}
+{{- printf "policy/v1beta1" }}
+{{- end }}
+{{- end }}
+
+{{/*
+Allow overriding alertmanager namespace
+*/}}
+{{- define "alertmanager.namespace" -}}
+{{- if .Values.namespaceOverride -}}
+{{- .Values.namespaceOverride -}}
+{{- else -}}
+{{- .Release.Namespace -}}
+{{- end -}}
+{{- end -}}

charts/alertmanager/templates/_images.tpl

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+{{- define "alertmanager.common.images.image" -}}
+{{- $registryName := "" }}
+{{- if and .global .global.imageRegistry }}
+    {{- $registryName = .global.imageRegistry }}
+{{- end }}
+{{- $repositoryName := .imageRoot.repository -}}
+{{- $separator := ":" -}}
+{{- $termination := "" -}}
+{{- if and .global .global.tag }}
+    {{- $termination = .global.tag | toString }}
+{{- end }}
+{{- if .imageRoot.registry }}
+    {{- $registryName = .imageRoot.registry -}}
+{{- end -}}
+{{- if empty $registryName }}
+    {{- if .imageRoot.defaultRegistry }}
+        {{- $registryName = .imageRoot.defaultRegistry }}
+    {{- end -}}
+{{- end -}}
+{{- if .imageRoot.tag }}
+    {{- $termination = .imageRoot.tag | toString -}}
+{{- end -}}
+{{- if .imageRoot.digest }}
+    {{- $separator = "@" -}}
+    {{- $termination = .imageRoot.digest | toString -}}
+{{- end -}}
+{{- if $registryName }}
+    {{- printf "%s/%s%s%s" $registryName $repositoryName $separator $termination -}}
+{{- else }}
+    {{- printf "%s%s%s" $repositoryName $separator $termination -}}
+{{- end }}
+{{- end -}}
+
+{{- define "alertmanager.image" -}}
+{{- $_dict := (dict "imageRoot" .Values.image "global" .Values.global) }}
+{{- if empty $_dict.imageRoot.tag }}
+    {{- $_ := set $_dict.imageRoot "tag" .Chart.AppVersion }}
+{{- end }}
+{{- include "alertmanager.common.images.image" $_dict }}
+{{- end -}}
+
+{{- define "alertmanager.configmapReload.image" -}}
+{{- $_dict := (dict "imageRoot" .Values.configmapReload.image "global" .Values.global) }}
+{{- include "alertmanager.common.images.image" $_dict }}
+{{- end -}}

charts/alertmanager/templates/_node-selectors.tpl

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+{{- define "alertmanager.common.nodeSelectors.nodeSelector" -}}
+{{- if and .global .global.nodeSelector }}
+    {{- $nodeSelector := .global.nodeSelector -}}
+    {{- if .nodeSelector }}
+        {{- $nodeSelector = merge .nodeSelector $nodeSelector -}}
+    {{- end -}}
+    {{- toYaml $nodeSelector }}
+{{- else }}
+    {{- toYaml .nodeSelector }}
+{{- end }}
+{{- end -}}
+
+{{- define "alertmanager.nodeSelector" -}}
+{{- $_dict := (dict "nodeSelector" .Values.nodeSelector "global" .Values.global) }}
+{{- include "alertmanager.common.nodeSelectors.nodeSelector" $_dict }}
+{{- end -}}

charts/alertmanager/templates/configmap.yaml

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+{{- if .Values.config.enabled }}
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "alertmanager.fullname" . }}
+  labels:
+    {{- include "alertmanager.labels" . | nindent 4 }}
+  {{- with .Values.configAnnotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  namespace: {{ include "alertmanager.namespace" . }}
+data:
+  alertmanager.yml: |
+  {{- $config := omit .Values.config "enabled" }}
+  {{- toYaml $config | default "{}" | nindent 4  }}
+  {{- range $key, $value := .Values.templates }}
+  {{ $key }}: |-
+    {{- $value | nindent 4 }}
+  {{- end }}
+{{- end }}

charts/alertmanager/templates/ingress.yaml

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+{{- if .Values.ingress.enabled }}
+{{- $fullName := include "alertmanager.fullname" . }}
+{{- $svcPort := .Values.service.port }}
+apiVersion: {{ include "alertmanager.ingress.apiVersion" . }}
+kind: Ingress
+metadata:
+  name: {{ $fullName }}
+  labels:
+    {{- include "alertmanager.labels" . | nindent 4 }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  namespace: {{ include "alertmanager.namespace" . }}
+spec:
+  {{- if .Values.ingress.className }}
+  ingressClassName: {{ .Values.ingress.className }}
+  {{- end }}
+  {{- if .Values.ingress.tls }}
+  tls:
+    {{- range .Values.ingress.tls }}
+    - hosts:
+        {{- range .hosts }}
+        - {{ . | quote }}
+        {{- end }}
+      secretName: {{ .secretName }}
+    {{- end }}
+  {{- end }}
+  rules:
+    {{- range .Values.ingress.hosts }}
+    - host: {{ .host | quote }}
+      http:
+        paths:
+          {{- range .paths }}
+          - path: {{ .path }}
+            pathType: {{ .pathType }}
+            backend:
+              service:
+                name: {{ $fullName }}
+                port:
+                  number: {{ $svcPort }}
+          {{- end }}
+    {{- end }}
+{{- end }}