Finding the "last successful" OST CI run of something

Hi, I understand that OST (or the job(s) that run it in CI) has some logic to decide what tests need to be ran based on the components that were changed since the last run. Suppose that I want to see how the last good run of something looked like. Say the engine, or vdsm, or hosted-engine. Is there a simple way to find that out? Also, we might risk here not doing some test because we think it's not needed, and perhaps we should run all tests at least once every X (say, 1 day). Do we already? How can I see logs of this? Thanks, -- Didi