Migrate apiserver request latency metric to apiserver_request_sli_duration_seconds

[dgrisonnet]

In Kubernetes 1.26 we renamed the apiserver_request_slo_duration_seconds metric to apiserver_request_sli_duration_seconds: kubernetes/kubernetes#112679 and we are looking at removing the _slo_ metric in 1.27. As such, the mixins should be updated to use the new metric.

/cc @metalmatze

[metalmatze]

I wonder if a recording rule could be helpful for the migration. I remember similar things from node-exporter migrations.

[dgrisonnet]

Yeah, that could definitely help since it would allow using whichever metric is available.

[dgrisonnet]

Thinking about it again, having a recording rule to select one the metrics will introduce these potential problems:

• without label aggregation, the evaluation will take a lot of time considering the sheer amount of metrics
• metrics won't be as fresh as they used to be since their freshness will now depend on the evaluation period

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[metalmatze]

I believe this is still valid, is it @dgrisonnet?

[dgrisonnet]

I believe you fixed it in #874 no?

[github-actions]

This issue has not had any activity in the past 30 days, so the
stale label has been added to it.

• The stale label will be removed if there is new activity
• The issue will be closed in 7 days if there is no new activity
• Add the keepalive label to exempt this issue from the stale check action

Thank you for your contributions!