Missing agones_k8s_client_cache_* metrics

[Kalaiselvi84]

What happened:

Setup of a GKE Autopilot cluster with Agones was completed, and Prometheus was configured for collecting metrics. During the setup of Grafana dashboards, it was observed that the agones_k8s_client_cache_* metrics are missing. These metrics are not present in the Prometheus exports from the /metrics endpoints of any services.

What you expected to happen:

Expected the agones_k8s_client_cache_* metrics in Grafana dashboards

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

It's possible that the metrics exported from client-go have changed. Relevant code is here, in case you want to take a look: https://github.com/googleforgames/agones/blob/e5d89bc2f47c6a34662c6afa6f1a057e250f81a8/pkg/metrics/kubernetes_client.go#L199C8-L199C35

Environment:

• Agones version: 1.36.0
• Kubernetes version (use kubectl version): 1.28
• Cloud provider or hardware configuration: GKE Autopilot

[markmandel]

Just noting that I'm seeing this in GKE standard, as well - I don't think it's an autopilot issue - I think something changed in client-go somewhere.

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