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[release-0.17] 🐛 prevent leader election when shutting down a non-elected manager #2752

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k8s-infra-cherrypick-robot

This is an automated cherry-pick of #2724

/assign alvaroaleman

When leader election is enabled, a non-leader manager would never start the LeaderElection runnable group.
Thus, as the shutdown process calls the sync.Once Start func of the runnableGroup; it will start a new election.
This change ensures `Start` is ineffective during shutdown.

The test ensures the LeaderElection runnableGroup is not started during shutdown.

Signed-off-by: Alexandre Mahdhaoui <alexandre.mahdhaoui@gmail.com>
@k8s-ci-robot k8s-ci-robot added cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Apr 2, 2024
@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Apr 2, 2024
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, k8s-infra-cherrypick-robot

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@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Apr 2, 2024
@k8s-ci-robot k8s-ci-robot merged commit 854a6b1 into kubernetes-sigs:release-0.17 Apr 2, 2024
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mx-psi referenced this pull request in open-telemetry/opentelemetry-collector-contrib Apr 9, 2024
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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[sigs.k8s.io/controller-runtime](https://github.com/kubernetes-sigs/controller-runtime)
| `v0.17.2` -> `v0.17.3` |
[![age](https://developer.mend.io/api/mc/badges/age/go/sigs.k8s.io%2fcontroller-runtime/v0.17.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
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|
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|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>kubernetes-sigs/controller-runtime
(sigs.k8s.io/controller-runtime)</summary>

###
[`v0.17.3`](https://github.com/kubernetes-sigs/controller-runtime/releases/tag/v0.17.3)

[Compare
Source](https://github.com/kubernetes-sigs/controller-runtime/compare/v0.17.2...v0.17.3)

##### What's Changed

- 🌱 Update to Kubernetes v1.29.2 by
[@&#8203;sbueringer](https://github.com/sbueringer) in
[https://github.com/kubernetes-sigs/controller-runtime/pull/2711](https://github.com/kubernetes-sigs/controller-runtime/pull/2711)
- 🐛 Cache: Keep selectors when byObject.Namespaces is defaulted by
[@&#8203;k8s-infra-cherrypick-robot](https://github.com/k8s-infra-cherrypick-robot)
in
[https://github.com/kubernetes-sigs/controller-runtime/pull/2749](https://github.com/kubernetes-sigs/controller-runtime/pull/2749)
- 🐛 Prevent leader election when shutting down a non-elected manager by
[@&#8203;k8s-infra-cherrypick-robot](https://github.com/k8s-infra-cherrypick-robot)
in
[https://github.com/kubernetes-sigs/controller-runtime/pull/2752](https://github.com/kubernetes-sigs/controller-runtime/pull/2752)
- 🐛 Runnable group should check if stopped before enqueueing by
[@&#8203;k8s-infra-cherrypick-robot](https://github.com/k8s-infra-cherrypick-robot)
in
[https://github.com/kubernetes-sigs/controller-runtime/pull/2761](https://github.com/kubernetes-sigs/controller-runtime/pull/2761)

**Full Changelog**:
kubernetes-sigs/controller-runtime@v0.17.2...v0.17.3

</details>

---

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---

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: opentelemetrybot <107717825+opentelemetrybot@users.noreply.github.com>
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