added custom metric sample (#177) #641

Job	Run time
build-lint-test (3.9, ubuntu-latest)	5m 14s
build-lint-test (3.9, macos-intel)	5m 53s
build-lint-test (3.9, macos-arm)	5m 19s
build-lint-test (3.9, windows-latest)	5m 42s
build-lint-test (3.12, ubuntu-latest)	5m 25s
build-lint-test (3.12, macos-intel)	6m 24s
build-lint-test (3.12, macos-arm)	5m 8s
build-lint-test (3.12, windows-latest)	5m 46s
	44m 51s

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