Re-write rw-heatmaps tool in golang

[jmhbnz]

What would you like to be added?

Sub task under #16467

We currently have https://github.com/etcd-io/etcd/tree/main/tools/rw-heatmaps as a helpful custom utility for qualifying etcd performance visually.

Unfortunately the current tooling is written in python which doesn't make sense for etcd as a golang project and introduces challenges keeping the tool maintained.

There was a historic stale attempt at this rewrite #15060 however this changed the existing tool functionality so was not a simple rewrite and did not get consensus to proceed.

@ivanvc has begun work on a newer rewrite that does not introduce any new features and would give us a clear pathway forward.

Why is this needed?

We need well maintained tooling to regularly qualify the performance of etcd.

[jmhbnz]

/assign @ivanvc

[k8s-ci-robot]

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In response to this:

/assign @ivanvc

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[ivanvc]

Leaving a comment so you can assign it to me, or perhaps prow will do it if I try?

[ivanvc]

/assign

[ivanvc]

Hi @jmhbnz, after reviewing today's triage meeting notes, I see this issue was discussed. As agreed in the meeting (the recording is not on YouTube yet), #15060 should be closed when I implement the line charts (hopefully soon). In my opinion, this issue can be closed now, but @ahrtr may also want to weigh in.

[ahrtr]

In my opinion, this issue can be closed now, but @ahrtr may also want to weigh in.

Closed.

[ahrtr]

OOPS, I misread the comment above, I closed the PR instead of this issue. I am good as long as eventually we can integrate the line chart. Please feel free to close this issue if you want.