Add Prometheus configuration to bundle OCP

[clobrano]

Why we need this PR

To allow User Workload Prometheus (UWP) metrics scraping for NHC, we need to modify existing bundle configuration as well as and deploy new configuration.

Changes made

Currently, only in OCP we are sure to have Prometheus installed, so this PR affects the bundle created for OCP only.

• created a config/optional/prometheus-ocp directory to hold the new configuration and documentation
  • ca-configmap.yaml: the ConfigMap which will have the CA bundle injected for usage in the client
  • monitor.yaml: the ServiceMonitor (to be installed manually by the user, see more in the readme) which will make the NHC prometheus endpoint visibile
  • readme.md: the complete UWP configuration guide
• modified config/manifests/ocp/
  • auth_proxy_service_patch.yaml: to modify NHC Service with the annotation to create the serving-cert-secret Secret node-healthcheck-tls
  • deployment_patch.yaml: to modify NHC deployment to mount the required configuration as volumes

Which issue(s) this PR fixes

https://issues.redhat.com/browse/ECOPROJECT-1760

Test plan

To configure NHC with UWP follow the steps in config/optional/prometheus-ocp/readme.md. To ease the test process, the script hack/ocp/test_create_bundle_ocp_image_in_quay.sh build the bundle image and pushes it to quay.io.

[openshift-ci[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[clobrano]

/test 4.15-openshift-e2e

[razo7]

The test didn't start. Lets try again /test 4.15-openshift-e2e

[razo7]

/lgtm Giving a chance to get more reviews /hold

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: clobrano, slintes

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/medik8s/node-healthcheck-operator/blob/main/OWNERS)~~ [clobrano,slintes] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[clobrano]

/retest

[clobrano]

/unhold