Document how to debug performance of prow job

[serathius]

What would you like to be added?

In robustness tests we noticed a series of flakes and we wanted to eliminate performance as a factor. @ah8ad3 has reached out to Kubernetes prow and found interesting dashboards:
https://monitoring-gke.prow.k8s.io/d/96Q8oOOZk/builds?orgId=1&refresh=30s&var-org=etcd-io&var-repo=etcd&var-job=ci-etcd-robustness-main-amd64&var-build=All&from=now-7d&to=now

We should preserve this knowledge and document for future how etcd contributors can navigate performance of prow jobs. Possibly a new section in etcd contributor documentation about prow that either links to the dashboard or some prow documentation.

Why is this needed?

Make it easier for others to debug etcd job performance issues.

[serathius]

cc @ah8ad3

[serathius]

cc @jmhbnz @ivanvc

[ivanvc]

I agree. There's also an EKS dashboard, but they are not documented anywhere in the infra testing repo, I also found about it by asking on Slack.

• GKE: https://monitoring-gke.prow.k8s.io/d/96Q8oOOZk/builds?orgId=1&refresh=30s&var-org=etcd-io&var-repo=etcd&var-build=All&from=now-7d&to=now
• EKS: https://monitoring-eks.prow.k8s.io/d/96Q8oOOZk/builds?orgId=1&refresh=30s&var-org=etcd-io&var-repo=etcd&var-build=All&from=now-7d&to=now