Remove metrics plumbing and deprecate/no-op public API #1259

Job	Run time
Tests (ubuntu-latest, 7.2, lowest)	21s
Tests (ubuntu-latest, 7.2, highest)	28s
Tests (ubuntu-latest, 7.3, lowest)	22s
Tests (ubuntu-latest, 7.3, highest)	48s
Tests (ubuntu-latest, 7.4, lowest)	33s
Tests (ubuntu-latest, 7.4, highest)	50s
Tests (ubuntu-latest, 8.0, lowest)	23s
Tests (ubuntu-latest, 8.0, highest)	59s
Tests (ubuntu-latest, 8.1, lowest)	21s
Tests (ubuntu-latest, 8.1, highest)	54s
Tests (ubuntu-latest, 8.2, lowest)	23s
Tests (ubuntu-latest, 8.2, highest)	56s
Tests (ubuntu-latest, 8.3, lowest)	21s
Tests (ubuntu-latest, 8.3, highest)	1m 4s
Tests (windows-latest, 7.2, lowest)	59s
Tests (windows-latest, 7.2, highest)	1m 1s
Tests (windows-latest, 7.3, lowest)	1m 4s
Tests (windows-latest, 7.3, highest)	1m 34s
Tests (windows-latest, 7.4, lowest)	1m 3s
Tests (windows-latest, 7.4, highest)	1m 41s
Tests (windows-latest, 8.0, lowest)	49s
Tests (windows-latest, 8.0, highest)	1m 39s
Tests (windows-latest, 8.1, lowest)	47s
Tests (windows-latest, 8.1, highest)	1m 31s
Tests (windows-latest, 8.2, lowest)	47s
Tests (windows-latest, 8.2, highest)	1m 36s
Tests (windows-latest, 8.3, lowest)	46s
Tests (windows-latest, 8.3, highest)	1m 35s
	25m 35s

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