Limit prometheus exemplar labels #5122

Job	Run time
build-graal	9m 8s
Build (macos-latest, 11)	1m 50s
Build (macos-latest, 17)	3m 1s
Build (macos-latest, 21)	1m 53s
Build (macos-13, 8)	4m 55s
Build (ubuntu-latest, 8)	3m 6s
Build (ubuntu-latest, 11)	2m 47s
Build (ubuntu-latest, 17)	2m 25s
Build (ubuntu-latest, 21)	2m 54s
Build (ubuntu-20.04, 21, true, true)	2m 40s
markdown-link-check / markdown-link-check	34s
misspell-check / misspell-check	5s
publish-snapshots (skipped)	5s
required-status-check	1s
	35m 24s

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