2.5. Setting up metrics collection

Procedure

1. Create a YAML file for the ServiceMonitor resource configuration. In this example, the file is called example-app-service-monitor.yaml.

2. Fill the file with the configuration for creating the ServiceMonitor resource:

   apiVersion: monitoring.coreos.com/v1
   kind: ServiceMonitor
   metadata:
     labels:
       k8s-app: prometheus-example-monitor
     name: prometheus-example-monitor
     namespace: ns1
   spec:
     endpoints:
     - interval: 30s
       port: web
       scheme: http
     selector:
       matchLabels:
         app: prometheus-example-app

   This configuration makes OpenShift Monitoring scrape the metrics exposed by the sample service deployed in "Deploying a sample service", which includes the single version metric.

3. Apply the configuration file to the cluster:

   $ oc apply -f example-app-service-monitor.yaml

   It will take some time to deploy the ServiceMonitor resource.

4. You can check that the ServiceMonitor resource is running:

   $ oc -n ns1 get servicemonitor

   Example output

   NAME                         AGE
   prometheus-example-monitor   81m