Yxjetcd pprof UI

[yangxuanjia]

add pprof UI for etcd

// http://127.0.0.1/debug/pprof/ui/
// http://127.0.0.1/debug/pprof/ui/allocs
// http://127.0.0.1/debug/pprof/ui/profile
// http://127.0.0.1/debug/pprof/ui/heap
// http://127.0.0.1/debug/pprof/goroutineui/

// http://127.0.0.1/debug/pprof/ui/block
// http://127.0.0.1/debug/pprof/ui/goroutine
// http://127.0.0.1/debug/pprof/ui/mutex
// http://127.0.0.1/debug/pprof/ui/threadcreate

[ptabor]

--@tobilarscheid-- @tbg @yangxuanjia
I see this is a clone of cockroachdb code (https://github.com/cockroachdb/cockroach/tree/master/pkg/server/debug/goroutineui).
Assuming we want to incorporate the UI, we should find a better model of sharing the code than copying it.

[tobilarscheid]

Pretty sure I am tagged by mistake :-)

[ptabor]

I'm sorry about this. I should have tagged @tbg because of these commits: cockroachdb/cockroach@9d7ca0f

[yangxuanjia]

@ptabor
Yes, this feature is good when have problem online, we can easy and quickly troubleshoot. It's wonderful for online system.

[ptabor]

@yangxuanjia I'm not questioning whether its useful. I just think that etcd community does not want to maintain its own clone of 1kloc maintained in another project. I would propose working with cockrouchdb community for finding a shared location for that code.

[yangxuanjia]

@ptabor you are right, it's better.

[yangxuanjia]

@ptabor , Did you interest in #12343 ?

[tbg]

FYI panicparse v2 has this:

https://github.com/maruel/panicparse/blob/master/stack/webstack/webstack.go

You may want to just use that directly. We wrote our code before this was available.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.

[ptabor]

Closing this PR, but happy to review integration with library supporting this, e.g. panicparse v2 in a separate PR as Tobis mentioned.