Add optional Prometheus PodMonitor, daemonset options

[briend]

/kind feature

What this PR does / why we need it:

• Adds an optional Prometheus PodMonitor, which has some advantages over ServiceMonitor (no need for Service and the associated complications with Endpoints and EndpointSlices, and supports > 1000 nodes more easily) (https://github.com/prometheus-operator/prometheus-operator/pull/4635#issuecomment-1066506084)
• Allows disabling the extra DaemonSet for Windows OS (or Linux if you don't need that)
• Adds metricRelabelings to ServiceMonitor for more flexibility

Special notes for your reviewer:

I didn't bump the appVersion from 2.4.0 since I have not tested 2.5.0 but it seems like it should be switched

Release note:

Optional Prometheus PodMonitor can support >1000 nodes more easily

[linux-foundation-easycla[bot]]

• :x: The commit (d871a2278d9bfd454af29bc3ed4aaffe43a02783, fbe2c81376060449e8665fc10a46faaf5b7f441a). This user is missing the User's ID, preventing the EasyCLA check. Consult GitHub Help to resolve.For further assistance with EasyCLA, please submit a support request ticket.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: briend Once this PR has been reviewed and has the lgtm label, please assign wongma7 for approval by writing /assign @wongma7 in a comment. For more information see:The Kubernetes Code Review Process.

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[mauriciopoppe]

Thanks for the PR, sorry it's been so long since someone had a chance to look at it, while this is proposing a solution I'm not sure about the problem it's trying to solve, maybe you could open an issue instead and then we can discuss over there about the problem and the possible solutions?

/remove-lifecycle stale

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/lifecycle stale

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/lifecycle rotten

[briend]

/remove-lifecycle stale

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: briend Once this PR has been reviewed and has the lgtm label, please assign saad-ali for approval. For more information see the Kubernetes Code Review Process.

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[briend]

/remove-lifecycle rotten

[briend]

I've opened an issue for discussing the original problem (we can't scrape metrics from more than 1000 nodes): https://github.com/kubernetes-sigs/sig-storage-local-static-provisioner/issues/380

[mauriciopoppe]

Thanks for creating the issue, I see that the k8s object introduced isn't a core kubernetes object (I see the PodMonitor CR whose CRD is defined in the Prometheus operator codebase https://github.com/prometheus-operator/prometheus-operator/blob/main/pkg/apis/monitoring/v1/podmonitor_types.go), I think that most of the storage related components don't bundle objects that aren't part of core k8s and it's up to the cluster administrator to install the appropriate CRDs for extensions.

Adding a CRD we don't own makes it hard to maintain the project too, let's say that we want to test this then we'd need to setup a cluster with the Prometheus operator installed first before installing local-static-provisioner.

An alternative approach is to install the local-static-provisioner helm chart as a dependency of some other chart, if you wrap this chart with your own chart you can add the Prometheus operator + PodMonitoring CRs that you want.

[k8s-ci-robot]

PR needs rebase.

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/lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

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/close

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