Metrics exporter to Prometheus with OTLP #5561

Job	Run time
Basic Checks	19m 57s
Measure coverage	17m 10s
Additional Builds and Concurrency Tests	13m 52s
miri	3m 9s
Release builds and tests	10m 0s
sanitize (address)	17m 34s
sanitize (address, multi-threading)	19m 20s
Slow tests	19m 17s
sanitize (leak)	8m 44s
sanitize (leak, multi-threading)	9m 36s
	2h 18m 39s

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