[stable/nginx-ingress] Add configurable serviceMonitor metricRelabelling and targetLabels

[calvinbui]

Signed-off-by: Calvin Bui 3604363+calvinbui@users.noreply.github.com

What this PR does / why we need it:

Target Labels: Adds the serviceMonitor targetLabels key as documented in the Prometheus Operator API

Metric Relabelings: Adds the ServiceMonitor metricRelabelings key as documented in the Prometheus Operator API. Used for adding, dropping or renaming labels at ingestion time, or to drop entire metrics that are not useful.

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• DCO signed
• Chart Version bumped
• Variables are documented in the README.md
• Title of the PR starts with chart name (e.g. [stable/mychartname])

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: calvinbui
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[k8s-ci-robot]

Hi @calvinbui. Thanks for your PR.

I'm waiting for a helm member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[calvinbui]

/assign @taharah

[ChiefAlexander]

This chart is being deprecated via #22823
The new location of the chart for changes is https://github.com/kubernetes/ingress-nginx/tree/master/charts/ingress-nginx

[calvinbui]

There's still no migration path so it's not really deprecated yet according to https://github.com/helm/charts/issues/21103

[calvinbui]

@ChiefAlexander should I re-open this over in ingress-nginx?

[scottrigby]

/hold

I'm working on a PR to add migration steps to the chart readme for the ingress-nginx/ingress-nginx chart and docs at https://kubernetes.github.io/ingress-nginx/deploy/upgrade/#with-helm.

@calvinbui Yes please open a PR over there. Thanks!

[calvinbui]

recreated at kubernetes/ingress-nginx#6039