Support label_limit, label_name_length_limit and label_value_length_limit configuration fields

[simonpasquier]

What is missing?

Prometheus v2.27.0 introduced 3 new configuration fields to prevent Prometheus from ingesting metrics with "excessive" labels:

• label_limit
• label_name_length_limit
• label_value_length_limit

The Prometheus operator should expose these fields in its CRDs.

See prometheus/prometheus#8291 for details.

Why do we need it?

Feature parity with Prometheus :)

Environment

• Prometheus Operator version:

N/A

Anything else we need to know?:

Like with enforcedSampleLimit and sampleLimit, we want to enforce minimal values at the Prometheus CRD level as well as support individual limits per ServiceMonitor, PodMonitor and Probe resources.

[slashpai]

If this not urgent I would like to work on it to get better understanding of CRDs :)