4.7. Configuring built-in monitoring with Prometheus

Prerequisites

• Go-based Operator generated using the Operator SDK
• Kubernetes-based cluster with the Prometheus Operator deployed

Procedure

• In the cmd/manager/main.go file of the generated Operator, change the value of metricsPort in the following line:

  var metricsPort int32 = 8383

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Prerequisites

• Go-based Operator generated using the Operator SDK
• Kubernetes-based cluster with the Prometheus Operator deployed

Procedure

• Add the metrics.CreateServiceMonitor() helper function to your Operator code:

  import(
      "k8s.io/api/core/v1"
      "github.com/operator-framework/operator-sdk/pkg/metrics"
      "machine.openshift.io/controller-runtime/pkg/client/config"
  )
  func main() {
  
      ...
      // Populate below with the Service(s) for which you want to create ServiceMonitors.
      services := []*v1.Service{}
      // Create one ServiceMonitor per application per namespace.
      // Change the below value to name of the Namespace you want the ServiceMonitor to be created in.
      ns := "default"
      // restConfig is used for talking to the Kubernetes apiserver
      restConfig := config.GetConfig()
  
      // Pass the Service(s) to the helper function, which in turn returns the array of ServiceMonitor objects.
      serviceMonitors, err := metrics.CreateServiceMonitors(restConfig, ns, services)
      if err != nil {
          // Handle errors here.
      }
      ...
  }

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