added custom metric sample #640

Job	Run time
build-lint-test (3.9, ubuntu-latest)	5m 10s
build-lint-test (3.9, macos-intel)	5m 48s
build-lint-test (3.9, macos-arm)	5m 27s
build-lint-test (3.9, windows-latest)	5m 44s
build-lint-test (3.12, ubuntu-latest)	5m 25s
build-lint-test (3.12, macos-intel)	6m 20s
build-lint-test (3.12, macos-arm)	5m 2s
build-lint-test (3.12, windows-latest)	5m 57s
	44m 53s

Provide feedback