Sync upstream to `9823a93c4238b3b549321ece051bbba6d3922741` #2579

Job	Run time
fuzz (./model/labels, FuzzFastRegexMatcher_WithStaticallyDefinedRegularExpressions)	1m 19s
test (slicelabels)	11m 11s
fuzz (./model/labels, FuzzFastRegexMatcher_WithFuzzyRegularExpressions)	1m 22s
test (stringlabels)	11m 2s
test (dedupelabels)	11m 20s
	36m 14s

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