Sync upstream to `f7373a1f91e63556ca3d0a8d21896b2cdace260c` #2576

Job	Run time
fuzz (./model/labels, FuzzFastRegexMatcher_WithStaticallyDefinedRegularExpressions)	1m 10s
test (slicelabels)	14m 15s
fuzz (./model/labels, FuzzFastRegexMatcher_WithFuzzyRegularExpressions)	1m 15s
test (stringlabels)	14m 9s
test (dedupelabels)	14m 11s
	45m 0s

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