Allow passing SetWatchErrorHandler to created informers

[rfratto]

Currently, when a new informer is created, it will wait for a cache sync before returning to the caller.

Unless the provided context is canceled, this call blocks forever if the informer fails to perform the ListWatch operation, such as being given an invalid Kubernetes API server address or if the authentication is lacking appropriate credentials to access the requested resource.

I would like the ability to pass a WatchErrorHandler in cache.Options to created informers so I can log the specific error back to the user to help them understand why things aren't working.

Until this is available, there are two workarounds I've identified:

• Pass a context which has a timeout, which prevents the call from blocking forever but you don't know what the underlying error is.
• Rely on the default implementation for WatchErrorHandler, but this doesn't work for systems that aren't using klog.

[k8s-triage-robot]

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/lifecycle stale

[alvaroaleman]

That makes sense. We should also likely provide a default implementation that uses the controller-runtime logger rather than klog, as the latter might not be enabled.

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/lifecycle rotten

[k8s-triage-robot]

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

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

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
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Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

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