added custom metric sample #639

Job	Run time
build-lint-test (3.9, ubuntu-latest)	5m 6s
build-lint-test (3.9, macos-intel)	5m 26s
build-lint-test (3.9, macos-arm)	5m 17s
build-lint-test (3.9, windows-latest)	5m 46s
build-lint-test (3.12, ubuntu-latest)	5m 13s
build-lint-test (3.12, macos-intel)	6m 16s
build-lint-test (3.12, macos-arm)	5m 1s
build-lint-test (3.12, windows-latest)	1s
	38m 6s

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