Unit tests, functional tests, automated CI/CD, etc all apply when building utilities or system software. Things like the DORA metrics are very often applied to

Unit tests, functional tests, automated CI/CD, etc all apply when building utilities or system software. Things like the DORA metrics are very often applied to “things where if they break they break in a big way” - to help teams design toward having the confidence to deploy without causing outages and to have limited impact when something does fail, and faster recovery etc.