[pprof] - Save heap profile to the file on Shutdown

[VihasMakwana]

Component(s)

extension/pprof

Is your feature request related to a problem? Please describe.

Currently, there is no straightforward way to get heap profile of the collector right before it gets terminated. Same functionality exists for CPU.
It would be highly beneficial to have the ability to write the heap profile to a file at that point.

Describe the solution you'd like

runtime/pprof has a function, WriteHeapProfile, that saves current heap profile to the file. We can introduce a config for this, similar to what we do for CPU profile.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• extension/pprof: @MovieStoreGuy

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[VihasMakwana]

@MovieStoreGuy when you have a moment, can you take a look at it?

[atoulme]

heap profile on shutdown? But everything is shut down then? What are you hoping to capture?

[VihasMakwana]

I think I misunderstood the shutdown sequence.
You're right. If we want to save heap profile, we need to save it right before shutdown and not in extension. The extensions are last in line when it comes to shutdown and all the relevant components will already be shut. I'll try to find an appropriate place for this feature.

[MovieStoreGuy]

It sounds like you almost want Continuous Profiling_ or Always On Profiling which will take snapshots of the application throughout its lifetime.

[VihasMakwana]

Yeah, kind of.