Refine legends of metrics `Request Duration` and `Request Handle Duration`.
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- Dominant language
- C++
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Description
Enhancement
The query types are grouped in the metrics Request Duration and Request Handle Duration, this reduces the amount of information we can get from the metric graph.

We should refine it.
Firstly, we can expand the type dimension, like graph Cop task memory usage:

Secondly, we can separate the le to different grpah.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
No source file, test, or entry point is named. Start by locating the metric definitions for Request Duration and Request Handle Duration, then inspect how their type and le dimensions are represented; done means the legends expose the query type and separate the le values into distinct graphs.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- observability-sre
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100