What metrics do you use to measure test stability?

To assess test stability, I use the following metrics:

• Pass Rate — shows how often tests pass without errors.
• Flaky Tests — the number of tests that sometimes fail without changes in the code, which is important to minimize.
• Test execution time — stable time indicates predictability and no hangs.
• Test coverage — helps understand how thoroughly the tests cover the functionality.

For example, if the pass rate drops and the number of flaky tests increases, it signals the need for analysis and fixing unstable tests.