Hi,
Where are you seeing “lines to cover” on a PR? If you’re seeing it on the PR’s measures page, then you’re demonstrably already using the feature the the question to answer is why you’re getting zeros.
Here’s a PR on a public project picked pretty much at random that shows coverage in the header and coverage-related metrics in the rail: https://sonarcloud.io/component_measures?branch=drivers-on-bms&id=it.eng.knowage%3Aspagobi-metamodel-core
Ann