Damien Lespiau 5d634e7db6 Add go profile instrumentation to kubectl ...

This commit adds two new global options to kubectl: --profile and
--profile-output, writing out go profiles to disk to debug interesting and
unexpected kubectl behaviour.

As an example, here is how to capture a block file, eg. for how long are we
blocked on I/O and where?

$ kubectl get nodes --profile=mutex -v6
$ go tool pprof -png ./profile.pprof > out.png
$ google-chrome out.png

Fixes: #68679

2018-09-18 18:28:43 +01:00

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