Add sidecar capability for statsd

templates/_statsd.yaml

@@ -0,0 +1,54 @@
+{{/*
+  The exporter container attached to every Mastodon pod
+*/}}
+
+{{- define "mastodon.statsdExporterContainer" }}
+{{- with .Values.mastodon.metrics.statsd }}
+{{- if and .exporter.enabled (not .address) }}
+- name: statsd-exporter
+  image: prom/statsd-exporter
+  args:
+    - "--statsd.mapping-config=/statsd-mappings/mastodon.yml"
+  resources:
+    requests:
+      cpu: "0.1"
+      memory: "180M"
+    limits:
+      cpu: "0.5"
+      memory: "250M"
+  ports:
+    - name: statsd
+      containerPort: {{ .exporter.port }}
+  volumeMounts:
+    - name: statsd-mappings
+      mountPath: /statsd-mappings
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+  The volume needed for the container above
+*/}}
+{{- define "mastodon.statsdExporterVolume" }}
+{{- with .Values.mastodon.metrics.statsd }}
+{{- if and .exporter.enabled (not .address) }}
+- name: statsd-mappings
+  configMap:
+    name: {{ include "mastodon.fullname" $ }}-statsd-mappings
+    items:
+      - key: mastodon-statsd-mappings.yml
+        path: mastodon.yml
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+  Labels added to every statsd_exporter-enabled pod
+*/}}
+{{- define "mastodon.statsdExporterLabels" }}
+{{- with .Values.mastodon.metrics.statsd }}
+{{- if and .exporter.enabled (not .address) }}
+mastodon/statsd-exporter: "true"
+{{- end }}
+{{- end }}
+{{- end }}

templates/configmap-env.yaml

@@ -325,6 +325,8 @@ data:
   LDAP_UID_CONVERSION_REPLACE: {{ . }}
   {{- end }}
   {{- end }}
-  {{- with .Values.mastodon.metrics.statsd.address }}
-  STATSD_ADDR: {{ . }}
+  {{- if .Values.mastodon.metrics.statsd.address }}
+  STATSD_ADDR: {{ .Values.mastodon.metrics.statsd.address }}
+  {{- else if .Values.mastodon.metrics.statsd.exporter.enabled }}
+  STATSD_ADDR: localhost:9125
   {{- end }}

templates/deployment-sidekiq.yaml

@@ -38,6 +38,7 @@ spec:
         checksum/config-secrets: {{ include ( print $.Template.BasePath "/secret-smtp.yaml" ) $context | sha256sum | quote }}
       labels:
         {{- include "mastodon.selectorLabels" $context | nindent 8 }}
+        {{- include "mastodon.statsdExporterLabels" $context | nindent 8 }}
         app.kubernetes.io/component: sidekiq-{{ .name }}
         app.kubernetes.io/part-of: rails
     spec:
@@ -63,6 +64,7 @@ spec:
           persistentVolumeClaim:
             claimName: {{ template "mastodon.fullname" $context }}-system
       {{- end }}
+      {{- include "mastodon.statsdExporterVolume" $ | indent 8 }}
       containers:
         - name: {{ $context.Chart.Name }}
           securityContext:
@@ -127,6 +129,7 @@ spec:
           {{- end }}
           resources:
             {{- toYaml (default (default $context.Values.resources $context.Values.mastodon.sidekiq.resources) .resources) | nindent 12 }}
+      {{- include "mastodon.statsdExporterContainer" $ | indent 8 }}
       {{- with $context.Values.nodeSelector }}
       nodeSelector:
         {{- toYaml . | nindent 8 }}

templates/deployment-web.yaml

@@ -25,6 +25,7 @@ spec:
         {{- include "mastodon.rollingPodAnnotations" . | nindent 8 }}
       labels:
         {{- include "mastodon.selectorLabels" . | nindent 8 }}
+        {{- include "mastodon.statsdExporterLabels" . | nindent 8 }}
         app.kubernetes.io/component: web
         app.kubernetes.io/part-of: rails
     spec:
@@ -45,6 +46,7 @@ spec:
         - name: system
           persistentVolumeClaim:
             claimName: {{ template "mastodon.fullname" . }}-system
+      {{- include "mastodon.statsdExporterVolume" $ | indent 8 }}
       {{- end }}
       containers:
         - name: {{ .Chart.Name }}-web
@@ -134,6 +136,7 @@ spec:
           resources:
             {{- toYaml . | nindent 12 }}
           {{- end }}
+        {{- include "mastodon.statsdExporterContainer" $ | indent 8 }}
       {{- with .Values.nodeSelector }}
       nodeSelector:
         {{- toYaml . | nindent 8 }}

templates/statsd-exporter-mappings.yaml

@@ -0,0 +1,107 @@
+{{- if and .Values.mastodon.metrics.statsd.exporter.enabled (not .Values.mastodon.metrics.statsd.address) }}
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ include "mastodon.fullname" . }}-statsd-mappings
+  labels:
+    {{- include "mastodon.labels" . | nindent 4 }}
+data:
+  mastodon-statsd-mappings.yml: |-
+    ## From https://ipng.ch/assets/mastodon/statsd-mapping.yaml
+    ## Prometheus Statsd Exporter mapping for Mastodon 4.0+
+    ##
+    ## Version 1.0, November 2022
+    ##
+    ## Documentation: https://ipng.ch/s/articles/2022/11/27/mastodon-3.html
+
+    mappings:
+      ## Web collector
+      - match: Mastodon\.production\.web\.(.+)\.(.+)\.(.+)\.status\.(.+)
+        match_type: regex
+        name: "mastodon_controller_status"
+        labels:
+          controller: $1
+          action: $2
+          format: $3
+          status: $4
+          mastodon: "web"
+      - match: Mastodon\.production\.web\.(.+)\.(.+)\.(.+)\.db_time
+        match_type: regex
+        name: "mastodon_controller_db_time"
+        labels:
+          controller: $1
+          action: $2
+          format: $3
+          mastodon: "web"
+      - match: Mastodon\.production\.web\.(.+)\.(.+)\.(.+)\.view_time
+        match_type: regex
+        name: "mastodon_controller_view_time"
+        labels:
+          controller: $1
+          action: $2
+          format: $3
+          mastodon: "web"
+      - match: Mastodon\.production\.web\.(.+)\.(.+)\.(.+)\.total_duration
+        match_type: regex
+        name: "mastodon_controller_duration"
+        labels:
+          controller: $1
+          action: $2
+          format: $3
+          mastodon: "web"
+
+      ## Database collector
+      - match: Mastodon\.production\.db\.tables\.(.+)\.queries\.(.+)\.duration
+        match_type: regex
+        name: "mastodon_db_operation"
+        labels:
+          table: "$1"
+          operation: "$2"
+          mastodon: "db"
+
+      ## Cache collector
+      - match: Mastodon\.production\.cache\.(.+)\.duration
+        match_type: regex
+        name: "mastodon_cache_duration"
+        labels:
+          operation: "$1"
+          mastodon: "cache"
+
+      ## Sidekiq collector
+      - match: Mastodon\.production\.sidekiq\.(.+)\.processing_time
+        match_type: regex
+        name: "mastodon_sidekiq_worker_processing_time"
+        labels:
+          worker: "$1"
+          mastodon: "sidekiq"
+      - match: Mastodon\.production\.sidekiq\.(.+)\.success
+        match_type: regex
+        name: "mastodon_sidekiq_worker_success_total"
+        labels:
+          worker: "$1"
+          mastodon: "sidekiq"
+      - match: Mastodon\.production\.sidekiq\.(.+)\.failure
+        match_type: regex
+        name: "mastodon_sidekiq_worker_failure_total"
+        labels:
+          worker: "$1"
+          mastodon: "sidekiq"
+      - match: Mastodon\.production\.sidekiq\.queues\.(.+)\.enqueued
+        match_type: regex
+        name: "mastodon_sidekiq_queue_enqueued"
+        labels:
+          queue: "$1"
+          mastodon: "sidekiq"
+      - match: Mastodon\.production\.sidekiq\.queues\.(.+)\.latency
+        match_type: regex
+        name: "mastodon_sidekiq_queue_latency"
+        labels:
+          queue: "$1"
+          mastodon: "sidekiq"
+      - match: Mastodon\.production\.sidekiq\.(.+)
+        match_type: regex
+        name: "mastodon_sidekiq_$1"
+        labels:
+          mastodon: "sidekiq"
+
+{{- end }}

values.yaml

@@ -202,6 +202,11 @@ mastodon:
     statsd:
       # -- Enable statsd publishing via STATSD_ADDR environment variable
       address: ""
+      # -- Alternatively, you can use this to have a statsd_exporter sidecar container running along all Mastodon containers and exposing metrics in OpenMetric/Prometheus format on each pod
+      #   Please note the exporter will not be enabled if metrics.statsd.address is not empty
+      exporter:
+        enabled: false
+        port: 9102
 
   # Sets the PREPARED_STATEMENTS environment variable: https://docs.joinmastodon.org/admin/config/#prepared_statements
   preparedStatements: true