Metrics exporter to Prometheus with OTLP (#1438) #5612

Job	Run time
Additional Builds and Concurrency Tests	16m 43s
miri	3m 9s
Measure coverage	6h 0m 13s
Basic Checks	23m 2s
Release builds and tests	13m 0s
sanitize (address)	22m 43s
Slow tests	21m 41s
sanitize (address, multi-threading)	19m 25s
sanitize (leak)	9m 20s
sanitize (leak, multi-threading)	8m 54s
	8h 18m 10s

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