feat(kernelLogWatcher): enable revive kmsg parser if channel closed

[daveoy]

this PR adds a revival mechanism for a recurring issue im facing.

in kubernetes, when a node is under significant load, the connection to /dev/kmsg can be closed unexpectedly.

instead of exiting the watcher and restarting the whole pod (subsequently clearing any conditions set by NPD during the new pod's problem daemon init), i would like to revive the kmsg channel and continue execution.

[k8s-ci-robot]

Hi @daveoy. Thanks for your PR.

I'm waiting for a kubernetes 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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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: daveoy
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[daveoy]

should close #1003

[wangzhen127]

/ok-to-test

[daveoy]

Is CI okay? Looks like the same failure on my other PRs marked ok to test....

[k8s-ci-robot]

@daveoy: 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-npd-build	2a540b2	link	true	/test pull-npd-build
pull-npd-test	2a540b2	link	true	/test pull-npd-test
pull-npd-e2e-test	2a540b2	link	true	/test pull-npd-e2e-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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. I understand the commands that are listed here.