Remove metrics plumbing and deprecate/no-op public API #1258

Job	Run time
Tests (ubuntu-latest, 7.2, lowest)	51s
Tests (ubuntu-latest, 7.2, highest)	21s
Tests (ubuntu-latest, 7.3, lowest)	22s
Tests (ubuntu-latest, 7.3, highest)	49s
Tests (ubuntu-latest, 7.4, lowest)	30s
Tests (ubuntu-latest, 7.4, highest)	49s
Tests (ubuntu-latest, 8.0, lowest)	22s
Tests (ubuntu-latest, 8.0, highest)	1m 3s
Tests (ubuntu-latest, 8.1, lowest)	23s
Tests (ubuntu-latest, 8.1, highest)	53s
Tests (ubuntu-latest, 8.2, lowest)	15s
Tests (ubuntu-latest, 8.2, highest)	57s
Tests (ubuntu-latest, 8.3, lowest)	22s
Tests (ubuntu-latest, 8.3, highest)	1m 6s
Tests (windows-latest, 7.2, lowest)	58s
Tests (windows-latest, 7.2, highest)	59s
Tests (windows-latest, 7.3, lowest)	59s
Tests (windows-latest, 7.3, highest)	1m 34s
Tests (windows-latest, 7.4, lowest)	55s
Tests (windows-latest, 7.4, highest)	1m 29s
Tests (windows-latest, 8.0, lowest)	47s
Tests (windows-latest, 8.0, highest)	1m 27s
Tests (windows-latest, 8.1, lowest)	46s
Tests (windows-latest, 8.1, highest)	1m 28s
Tests (windows-latest, 8.2, lowest)	49s
Tests (windows-latest, 8.2, highest)	1m 36s
Tests (windows-latest, 8.3, lowest)	51s
Tests (windows-latest, 8.3, highest)	1m 29s
	25m 10s

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