kubevela/docs/developers/set-metrics.md

Monitoring Application

If your application has exposed metrics, you can easily setup monitoring system with the help of metric capability.

Let's run christianhxc/gorandom:1.0 as an example app. The app will emit random latencies as metrics.

$ vela svc deploy metricapp -t webservice --image christianhxc/gorandom:1.0 --port 8080

Then add metric by:

$ vela metric metricapp
Adding metric for app metricapp
⠋ Deploying ...
✅ Application Deployed Successfully!
  - Name: metricapp
    Type: webservice
    HEALTHY Ready: 1/1
    Routes:
      - ✅ metric: Monitoring port: 8080, path: /metrics, format: prometheus, schema: http.
    Last Deployment:
      Created at: 2020-11-02 14:31:56 +0800 CST
      Updated at: 2020-11-02T14:32:00+08:00

The metrics trait will automatically discover port and label to monitor if no parameters specified. If more than one ports found, it will choose the first one by default.

Verify that the metrics are collected on prometheus

kubectl --namespace monitoring port-forward `k -n monitoring get pods -l prometheus=oam -o name` 9090

Then access the prometheus dashboard via http://localhost:9090/targets