tree 7a725f62b740337f630fae7ea3acef8641193de0
parent 6b303a643c10fdbc4dc983f03f7dce702a50d440
author Luca Milanesio <luca.milanesio@gmail.com> 1706831231 +0000
committer Luca Milanesio <luca.milanesio@gmail.com> 1706834423 +0000

Add metrics for git/upload-pack/*bitmap* misses

JGit packer tracks the number of times that an object was not
found in the bitmap index or if the bitmap index was completely
missing. The Gerrit admin may be interested in knowing that
the incoming traffic is slowed down by excessive bitmap
index misses because of the increase of the overall git-upload-pack
latencies and the impact on the server's throughput.

Also add a specific counter for when the bitmap index is totally
missing, which the Gerrit admin should use for setting alerts
of possible GC cycles being ineffective.

Add the git/upload-pack/bitmap_index_misses_count for beging used
in performance graphs, while the git/upload-pack/no_bitmap_index
should be more suitable for alerts.

Release-Notes: Add metrics for git/upload-pack/bitmap_index_misses_count and a separate one for missing bitmap indexs
Change-Id: Ie76bdcc39073748a5a0c59618cba58d286e08ba9