Enabling the metrics endpoint

The metrics endpoint is not enabled by default. To enable the metrics endpoint, follow the instructions in the next sections depending on whether you installed ECK through the Helm chart or the manifests.

If you installed ECK through the Helm chart commands listed in Install ECK using the Helm chart, you can set config.metrics.port to a value greater than 0 in your values file and the metrics endpoint will be enabled.

If you installed ECK using the manifests using the commands listed in Install ECK using the YAML manifests, some additional changes will be required to enable the metrics endpoint.

1. Enable the metrics endpoint in the ConfigMap.

   cat <<EOF | kubectl apply -f -
   kind: ConfigMap
   apiVersion: v1
   metadata:
     name: elastic-operator
     namespace: elastic-system
   data:
     eck.yaml: |-
       log-verbosity: 0
       metrics-port: 8080
       metrics-host: 0.0.0.0
       container-registry: docker.elastic.co
       max-concurrent-reconciles: 3
       ca-cert-validity: 8760h
       ca-cert-rotate-before: 24h
       cert-validity: 8760h
       cert-rotate-before: 24h
       disable-config-watch: false
       exposed-node-labels: [topology.kubernetes.io/.*,failure-domain.beta.kubernetes.io/.*]
       set-default-security-context: auto-detect
       kube-client-timeout: 60s
       elasticsearch-client-timeout: 180s
       disable-telemetry: false
       distribution-channel: all-in-one
       validate-storage-class: true
       enable-webhook: true
       webhook-name: elastic-webhook.k8s.elastic.co
       webhook-port: 9443
       operator-namespace: elastic-system
       enable-leader-election: true
       elasticsearch-observation-interval: 10s
       ubi-only: false
   EOF
   

2. Patch the StatefulSet to expose the metrics port.

   kubectl patch sts -n elastic-system elastic-operator --patch-file=/dev/stdin <<-EOF
   spec:
     template:
       spec:
         containers:
           - name: manager
             ports:
             - containerPort: 9443
               name: https-webhook
               protocol: TCP
             - containerPort: 8080
               protocol: TCP
               name: metrics
   EOF
   

   The ECK operator will be recreated after applying the patch.

3. If using the Prometheus operator, install a PodMonitor to allow Prometheus to scrape the metrics endpoint.

   cat <<EOF | kubectl apply -f -
   apiVersion: monitoring.coreos.com/v1
   kind: PodMonitor
   metadata:
     name: elastic-operator
     namespace: elastic-system
     labels:
       control-plane: elastic-operator
       app.kubernetes.io/component: metrics
   spec:
     podMetricsEndpoints:
       - port: metrics
         path: /metrics
         interval: 1m
         scrapeTimeout: 30s
     namespaceSelector:
       matchNames:
         - elastic-system
     selector:
       matchLabels:
         control-plane: elastic-operator
   EOF
   

• If you're using ECK 2.16 or earlier, secure the metrics endpoint.
• If you're using Prometheus, configure Prometheus to be able to collect ECK metrics.