Add PodMonitor Support with Metric Relabeling

[wonderg]

Description:

This PR introduces support for PodMonitor, enhancing the integration with Prometheus Operator. A key feature added is the ability to define metric relabeling configurations, giving users more flexibility in shaping the scraped metrics.

Changes include:

• Updated README.md to reflect the new configurable parameter podmonitor.metricRelabelings.
• Added a new template for PodMonitor with provisions for metric relabeling.

[wonderg]

I've updated charts/node-local-dns/templates/serviceaccount.yaml as well to fix possible logical issues

[ERROR] templates/serviceaccount.yaml: unable to parse YAML: invalid Yaml document separator: apiVersion: v1

The issue is with the --- separator at the beginning of the template combined with the conditional block {{- if .Values.serviceAccount.create -}}. If .Values.serviceAccount.create is set to false, Helm will render the template as an empty YAML file with just the --- separator, which is invalid.

To fix the issue, moved the separator --- inside the conditional block

[MonolithProjects]

Hi @wonderg . Thanks for this PR. It would be nice to have an option to enable/disable podmonitor

podmonitor:
  enabled: true
  metricRelabelings: []
....

[mjtrangoni]

@wonderg any news on this? I would really love to get all 3 open PR merged

[wonderg]

1

sure, please check recent commits.

[MonolithProjects]

Hi @wonderg , it looks good. Just please bump the chart version to 1.6.0 in charts/node-local-dns/Chart.yaml

[wonderg]

1.6.0

Hi @wonderg , it looks good. Just please bump the chart version to 1.6.0 in charts/node-local-dns/Chart.yaml

sure, just bumped it.

[MonolithProjects]

LGTM. Thanks @wonderg