safely consuming kstatus collector updates

[ecordell]

The collector protects ResourceStatuses with a mutex for updates, but then passes the whole object to a notify callback:

cli-utils/pkg/kstatus/polling/collector/collector.go

Lines 91 to 93 in 8609e42

	if observer != nil {
	observer.Notify(o, e)
	}

Since the callback runs in a goroutine without any synchronization, the read is racy (and potentially very out of date).

The simplest way to fix it would be to lock around the notify call, but of course then observers can potentially block the poller. I thought I'd open an issue since there should probably be some discussion around the intended use.

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[ecordell]

/remove-lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

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• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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[karlkfi]

pkg/kstatus/polling should probably be deprecated.
pkg/kstatus/watcher is the preferred way to get status updates now.

If you want to make a PR to fix it, I'll review it, but we're not really investing in the polling any more.

[k8s-triage-robot]

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[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

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• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle rotten