update SetOutput example

[BenTheElder]

klog.SetOutput is a bit of a footgun right now, severities above INFO will write to the "files" with fallthrough to the lower files, potentially leading to the same line being written as many as 4 times to the same writer.

I think the safest usage of this right now is probably something like:

klog.SetOutput(ioutil.Discard)
klog.SetOutputBySeverity("INFO", myWriter)

This works pretty nicely, but probably need some more documentation. I initially just did:

klog.SetOutput(myWriter)

which has surprising (duplicated) output in some cases

[simonpasquier]

I'm hitting the same kind of issue as I'm trying to build an adapter that would allow to get klog logs to a github.com/go-kit/kit instance. It would be nice if there was an option to avoid the automatic fallthrough mechanism.

[DirectXMan12]

that second usecase sounds like a good impetus for eventually switch libraries over to logr, or something similar, that doesn't actually log.

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[DirectXMan12]

similar to #53

[DirectXMan12]

/remove-lifecycle stale

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[detiber]

/remove-lifecycle stale

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

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