Metrics exporter to Prometheus with OTLP #5568

Job	Run time
Measure coverage	16m 53s
Additional Builds and Concurrency Tests	15m 6s
miri	3m 14s
Basic Checks	19m 24s
Release builds and tests	11m 48s
sanitize (address)	18m 58s
Slow tests	19m 2s
sanitize (address, multi-threading)	19m 52s
sanitize (leak)	7m 48s
sanitize (leak, multi-threading)	9m 14s
	2h 21m 19s

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