Remove locks for Pods in "Shutdown" status

[scheying]

Kubernetes introduced "Graceful Node Shutdown" as an Alpha feature in 1.20. Pods that are evicted by this mechanism have their status.reason attribute set to "Shutdown". This commit extends the garbage collection so that locks for Pods in the "Shutdown" state are also released.

Deadlocks caused by Pods in "shutdown" state still holding leader locks were observed on a live GKE Cluster with preemtible nodes.

This might also fix #73.

[openshift-ci]

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[openshift-ci]

Hi @scheying. Thanks for your PR.

I'm waiting for a operator-framework member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[witsch]

@fabianvf @joelanford would you mind having a look, please? The change looks pretty straightforward (and very small anyway) and the issue also exists for us… 😊

[openshift-bot]

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/lifecycle rotten
/remove-lifecycle stale

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@openshift-bot: Closed this PR.

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