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Add linter rules to ensure we don't accidentally emit metrics directl… #243

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Run time

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Job	Run time
go-fmt-and-vet	12s
go-test (1.19, x32)	3m 12s
go-test (1.19, x64)	14s
go-test (1.20, x32)	3m 18s
go-test (1.20, x64)	3m 3s
go-test-compat	0s
	9m 59s