1. Documentation
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Using metrics

Monitoring stack components are deployed by default in every OpenShift Container Platform installation and are managed by the Cluster Monitoring Operator (CMO). These components include Prometheus, Alertmanager, Thanos Querier, and others. The CMO also deploys the Telemeter Client, which sends a subset of data from platform Prometheus instances to Red Hat to facilitate Remote Health Monitoring for clusters.

When you have added your application to the mesh, you can monitor the in-cluster health and performance of your applications running on OpenShift Container Platform with metrics and customized alerts for CPU and memory usage, network connectivity, and other resource usage.

Configuring OpenShift Monitoring with Service Mesh

You can integrate Red Hat OpenShift Service Mesh with user-workload monitoring.

Prerequisites
Procedure

  1. Apply a ServiceMonitor object to monitor the Istio control plane:

    Example ServiceMonitor object
    apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: istiod-monitor
  namespace: istio-system
spec:
  targetLabels:
  - app
  selector:
    matchLabels:
      istio: pilot
  endpoints:
  - port: http-monitoring
    interval: 30s

  2. Apply a PodMonitor object to collect metrics from Istio proxies:

    Example PodMonitor object
    apiVersion: monitoring.coreos.com/v1
kind: PodMonitor
metadata:
  name: istio-proxies-monitor
  namespace: istio-system (1)
spec:
  selector:
    matchExpressions:
    - key: istio-prometheus-ignore
      operator: DoesNotExist
  podMetricsEndpoints:
  - path: /stats/prometheus
    interval: 30s
    relabelings:
    - action: keep
      sourceLabels: ["__meta_kubernetes_pod_container_name"]
      regex: "istio-proxy"
    - action: keep
      sourceLabels: ["__meta_kubernetes_pod_annotationpresent_prometheus_io_scrape"]
    - action: replace
      regex: (\d+);(([A-Fa-f0-9]{1,4}::?){1,7}[A-Fa-f0-9]{1,4})
      replacement: '[$2]:$1'
      sourceLabels: ["__meta_kubernetes_pod_annotation_prometheus_io_port","__meta_kubernetes_pod_ip"]
      targetLabel: "__address__"
    - action: replace
      regex: (\d+);((([0-9]+?)(\.|$)){4})
      replacement: '$2:$1'
      sourceLabels: ["__meta_kubernetes_pod_annotation_prometheus_io_port","__meta_kubernetes_pod_ip"]
      targetLabel: "__address__"
    - action: labeldrop
      regex: "__meta_kubernetes_pod_label_(.+)"
    - sourceLabels: ["__meta_kubernetes_namespace"]
      action: replace
      targetLabel: namespace
    - sourceLabels: ["__meta_kubernetes_pod_name"]
      action: replace
      targetLabel: pod_name
    1 Because OpenShift Container Platform monitoring ignores the namespaceSelector spec in ServiceMonitor and PodMonitor objects, you must apply the PodMonitor object in all mesh namespaces, including the Istio control plane namespace.

  3. Go to the OpenShift Console → Observe → Metrics, and run the query istio_requests_total.

The Metrics implementation can take a few minutes for the query to return results.