feat: Add simple exporter for prometheus

charts/prometheus-exporter/.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/prometheus-exporter/Chart.yaml

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+apiVersion: v2
+name: prometheus-exporter
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.16.0"

charts/prometheus-exporter/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 {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ include "prometheus-exporter.fullname" . }})
+  export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}")
+  echo http://$NODE_IP:$NODE_PORT
+{{- else if contains "LoadBalancer" .Values.service.type }}
+     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
+           You can watch the status of by running 'kubectl get --namespace {{ .Release.Namespace }} svc -w {{ include "prometheus-exporter.fullname" . }}'
+  export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ include "prometheus-exporter.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 {{ .Release.Namespace }} -l "app.kubernetes.io/name={{ include "prometheus-exporter.name" . }},app.kubernetes.io/instance={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
+  export CONTAINER_PORT=$(kubectl get pod --namespace {{ .Release.Namespace }} $POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
+  echo "Visit http://127.0.0.1:8080 to use your application"
+  kubectl --namespace {{ .Release.Namespace }} port-forward $POD_NAME 8080:$CONTAINER_PORT
+{{- end }}

charts/prometheus-exporter/templates/_helpers.tpl

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+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "prometheus-exporter.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 "prometheus-exporter.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 "prometheus-exporter.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "prometheus-exporter.labels" -}}
+helm.sh/chart: {{ include "prometheus-exporter.chart" . }}
+{{ include "prometheus-exporter.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "prometheus-exporter.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "prometheus-exporter.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "prometheus-exporter.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "prometheus-exporter.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}
+
+{{- define "prometheus-exporter.containers" -}}
+- name: php-fpm
+  securityContext:
+    {{- toYaml .Values.securityContext | nindent 4 }}
+  image: "{{ .Values.image.repository }}:{{ .Values.image.tag | default .Chart.AppVersion }}"
+  imagePullPolicy: {{ .Values.image.pullPolicy }}
+  livenessProbe:
+    exec:
+        command:
+            - php-fpm-healthcheck
+    initialDelaySeconds: 0
+    periodSeconds: 10
+  readinessProbe:
+    exec:
+        command:
+            - php-fpm-healthcheck # a simple ping since this means it's ready to handle traffic
+    initialDelaySeconds: 1
+    periodSeconds: 5
+  resources:
+    {{- toYaml .Values.resources | nindent 4 }}
+  {{- with .Values.volumeMounts }}
+  volumeMounts:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- with .Values.env }}
+  env:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+- name: nginx
+  securityContext:
+    {{- toYaml .Values.securityContext | nindent 4 }}
+  image: "nginx:1.24-alpine"
+  imagePullPolicy: {{ .Values.image.pullPolicy }}
+  ports:
+    - name: http
+      containerPort: {{ .Values.service.port }}
+      protocol: TCP
+  livenessProbe:
+    httpGet:
+      path: /status
+      port: http
+  readinessProbe:
+    httpGet:
+      path: /status
+      port: http
+  resources:
+    {{- toYaml .Values.resources | nindent 4 }}
+  volumeMounts:
+    - name: nginx-config-volume
+      mountPath: /etc/nginx/conf.d/default.conf
+      subPath: nginx.conf
+    - name: nginx-config-volume
+      mountPath: /etc/nginx/fastcgi_params
+      subPath: fastcgi_params
+    {{- with .Values.volumeMounts }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+{{- end }}

charts/prometheus-exporter/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ include "prometheus-exporter.fullname" . }}
+  labels:
+    {{- include "prometheus-exporter.labels" . | nindent 4 }}
+spec:
+  {{- if not .Values.autoscaling.enabled }}
+  replicas: {{ .Values.replicaCount }}
+  {{- end }}
+  selector:
+    matchLabels:
+      {{- include "prometheus-exporter.selectorLabels" . | nindent 6 }}
+  template:
+    metadata:
+      {{- with .Values.podAnnotations }}
+      annotations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      labels:
+        {{- include "prometheus-exporter.labels" . | nindent 8 }}
+	{{- with .Values.podLabels }}
+        {{- toYaml . | nindent 8 }}
+        {{- end }}
+    spec:
+      {{- with .Values.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      serviceAccountName: {{ include "prometheus-exporter.serviceAccountName" . }}
+      securityContext:
+        {{- toYaml .Values.podSecurityContext | nindent 8 }}
+      containers:
+        {{- include "prometheus-exporter.containers" . | nindent 8 }}
+      volumes:
+        - name: nginx-config-volume
+          configMap:
+            name: {{ include "prometheus-exporter.fullname" . }}-nginx-config
+      {{- with .Values.volumes }}
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.nodeSelector }}
+      nodeSelector:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.affinity }}
+      affinity:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
+      {{- with .Values.tolerations }}
+      tolerations:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}

charts/prometheus-exporter/templates/ingress.yaml

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+{{- if .Values.ingress.enabled -}}
+{{- $fullName := include "prometheus-exporter.fullname" . -}}
+{{- $svcPort := .Values.service.port -}}
+{{- if and .Values.ingress.className (not (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion)) }}
+  {{- if not (hasKey .Values.ingress.annotations "kubernetes.io/ingress.class") }}
+  {{- $_ := set .Values.ingress.annotations "kubernetes.io/ingress.class" .Values.ingress.className}}
+  {{- end }}
+{{- end }}
+{{- if semverCompare ">=1.19-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1
+{{- else if semverCompare ">=1.14-0" .Capabilities.KubeVersion.GitVersion -}}
+apiVersion: networking.k8s.io/v1beta1
+{{- else -}}
+apiVersion: extensions/v1beta1
+{{- end }}
+kind: Ingress
+metadata:
+  name: {{ $fullName }}
+  labels:
+    {{- include "prometheus-exporter.labels" . | nindent 4 }}
+  {{- with .Values.ingress.annotations }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  {{- if and .Values.ingress.className (semverCompare ">=1.18-0" .Capabilities.KubeVersion.GitVersion) }}
+  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 }}
+            {{- if and .pathType (semverCompare ">=1.18-0" $.Capabilities.KubeVersion.GitVersion) }}
+            pathType: {{ .pathType }}
+            {{- end }}
+            backend:
+              {{- if semverCompare ">=1.19-0" $.Capabilities.KubeVersion.GitVersion }}
+              service:
+                name: {{ $fullName }}-metrics
+                port:
+                  number: {{ $svcPort }}
+              {{- else }}
+              serviceName: {{ $fullName }}
+              servicePort: {{ $svcPort }}
+              {{- end }}
+          {{- end }}
+    {{- end }}
+{{- end }}

charts/prometheus-exporter/templates/nginx-config.yaml

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+kind: ConfigMap
+apiVersion: v1
+metadata:
+  name: {{ include "prometheus-exporter.fullname" . }}-nginx-config
+  labels:
+    {{- include "prometheus-exporter.labels" . | nindent 4 }}
+data:
+  nginx.conf: |-
+    server {
+      listen {{ .Values.service.port }} default_server;
+      listen [::]:{{ .Values.service.port }} default_server;
+
+      # Set nginx to serve files from the shared volume!
+      server_tokens off;
+      server_name _;
+
+      location /status {
+        access_log off;
+        return 200;
+      }
+
+      location / {
+        include fastcgi_params;
+
+        fastcgi_read_timeout 600s;
+        fastcgi_pass 127.0.0.1:9000;
+      }
+    }
+  fastcgi_params: |-
+    fastcgi_param   QUERY_STRING            $query_string;
+    fastcgi_param   REQUEST_METHOD          $request_method;
+    fastcgi_param   CONTENT_TYPE            $content_type;
+    fastcgi_param   CONTENT_LENGTH          $content_length;
+
+    fastcgi_param   SCRIPT_FILENAME         {{ .Values.fastcgi.root }}{{ .Values.fastcgi.index }};
+    fastcgi_param   SCRIPT_NAME             {{ .Values.fastcgi.index }};
+    fastcgi_param   PATH_INFO               $fastcgi_path_info;
+    fastcgi_param   PATH_TRANSLATED         {{ .Values.fastcgi.root }}$fastcgi_path_info;
+    fastcgi_param   REQUEST_URI             $request_uri;
+    fastcgi_param   DOCUMENT_URI            $document_uri;
+    fastcgi_param   DOCUMENT_ROOT           {{ .Values.fastcgi.root }};
+    fastcgi_param   SERVER_PROTOCOL         $server_protocol;
+
+    fastcgi_param   GATEWAY_INTERFACE       CGI/1.1;
+    fastcgi_param   SERVER_SOFTWARE         nginx/$nginx_version;
+
+    fastcgi_param   REMOTE_ADDR             $remote_addr;
+    fastcgi_param   REMOTE_PORT             $remote_port;
+    fastcgi_param   SERVER_ADDR             $server_addr;
+    fastcgi_param   SERVER_PORT             $server_port;
+    fastcgi_param   SERVER_NAME             $server_name;
+
+    fastcgi_param   HTTPS                   $https;
+
+    # PHP only, required if PHP was built with --enable-force-cgi-redirect
+    fastcgi_param   REDIRECT_STATUS         200;

charts/prometheus-exporter/templates/service-monitor.yaml

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+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ include "prometheus-exporter.fullname" . }}-monitor
+  labels:
+    release: kps
+    app: {{ include "prometheus-exporter.fullname" . }}
+spec:
+  endpoints:
+    - port: metrics
+      interval: 15s
+      scrapeTimeout: 10s
+  namespaceSelector:
+    matchNames:
+      - monitoring
+  selector:
+    {{- include "prometheus-exporter.selectorLabels" . | nindent 4 }}