pageserver: add read depth metrics and test #7464
Merged
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Problem
We recently went through an incident where compaction was inhibited by a bug.
We didn't observe this until quite late because we did not have alerting on deep reads.
Summary of changes
the compaction issue mentioned earlier.
Once this merges and we have a better understanding for where the upper bound is
merge these warnings to aid debugging: #7465
Related #7428
Checklist before requesting a review
Checklist before merging