Fix issue with ignored StatefulSet labels on Cilium.

[axel7born]

How to categorize this PR?

/area networking
/kind bug

What this PR does / why we need it:
Cilium ignores the StatefulSet pod label as relevant for identities. This label can't be used as podSelector in NetworkPoliciys. This PR adds an additional label to the pods of vpn-seed-server StateFulset. The label is used Selector in the vpn-seed-server services and by the networkpolicy controller as podSelector for network policies.

https://docs.cilium.io/en/stable/operations/performance/scalability/identity-relevant-labels/

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

Fixes an issue with ignored `StatefulSet` labels on Cilium.

[gardener-prow]

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

[gardener-prow]

@axel7born: The label(s) kind/fix cannot be applied, because the repository doesn't have them.

In response to this:

How to categorize this PR?

/area networking
/kind fix

What this PR does / why we need it:
Cilium ignores the StatefulSet pod label as relevant for identities. This label can't be used as podSelector in NetworkPoliciys. This PR adds an additional label to the pods of vpn-seed-server StateFulset. The label is used Selector in the vpn-seed-server services and by the networkpolicy controller as podSelector for network policies.

https://docs.cilium.io/en/stable/operations/performance/scalability/identity-relevant-labels/

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

Fixes an issue with ignored `StatefulSet` labels on Cilium.

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[gardener-prow]

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[axel7born]

/test all

[axel7born]

/test all

[gardener-prow]

@axel7born: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gardener-unit	545ff26	link	true	/test pull-gardener-unit
pull-gardener-e2e-kind-ha-multi-zone	545ff26	link	true	/test pull-gardener-e2e-kind-ha-multi-zone

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see our testing guideline for how to avoid and hunt flakes.

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[ScheererJ]

@DockToFuture and I have decided to use gardener/gardener-extension-networking-cilium#326 instead of this or https://github.com/ScheererJ/gardener/tree/enhancement/ha-vpn-headless to mitigate the issues introduced by cilium v1.15 with regards to the network policy label handling. Hence, this pull request is no longer required.

/close

[gardener-prow]

@ScheererJ: Closed this PR.

In response to this:

@DockToFuture and I have decided to use gardener/gardener-extension-networking-cilium#326 instead of this or https://github.com/ScheererJ/gardener/tree/enhancement/ha-vpn-headless to mitigate the issues introduced by cilium v1.15 with regards to the network policy label handling. Hence, this pull request is no longer required.

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.