2010YOUY01 opened a new pull request, #18216:
URL: https://github.com/apache/datafusion/pull/18216
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## Rationale for this change
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Now we have to search in the code comment (or even implementation) to find
the documentation of certain metrics, it would be better to open a page in the
`user-guide` for metrics.
The doc has to be manually updated, the metrics construction is scattered in
the codebase, so it's hard to make it auto-generated.
This PR only includes 2 common metrics, I plan to add more operator-specific
metrics while working on https://github.com/apache/datafusion/issues/18116
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