OpenClover must be replaced
The OpenClover plugin for Gradle is still available, but its maintainer has stopped supporting it (gradle 6.5 is the last supported version). Thus, it does not receive fixes and is not fully compatible with gradle 6.7. It will stop working in 7.x due to deprecated API.
Thus, we have to switch. JaCoCo provides also test coverage checks, is well maintained and used in other larger projects https://www.jacoco.org/
Setup is complete. Results look promising in the specific branch build.