Mastodon, statsd-exporter, and Prometheus

Mastodon environment variable, see https://docs.joinmastodon.org/admin/config/

STATSD_ADDR=127.0.0.1:9125

Added a statsd-exporter container to my Mastodon pod, see https://hub.docker.com/r/prom/statsd-exporter/

    spec:
      containers:
      - image: prom/statsd-exporter
        imagePullPolicy: IfNotPresent
        name: statsd-exporter
        ports:
        - containerPort: 9125
          name: listen
          protocol: UDP
        - containerPort: 9102
          name: web
          protocol: TCP

This article has a nice intro on how to get going with servicemonitor resources. Make sure your’ve got your labels set!

apiVersion: v1
kind: Service
metadata:
  labels:
    app: mastodon
  name: mastodon
  namespace: mastodon
spec:
  ports:
  - name: statsd-exporter
    port: 9102
    protocol: TCP
    targetPort: 9102
  - name: mastodon
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: mastodon
  sessionAffinity: None
  type: ClusterIP

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    app: mastodon
  name: mastodon
  namespace: mastodon
spec:
  endpoints:
  - interval: 30s
    path: /metrics
    port: statsd-exporter
    scheme: http
  namespaceSelector:
    matchNames:
    - mastodon
  selector:
    matchLabels:
      app: mastodon