In a PR run, for example #14672
Click on the check mark or X for the CI results you want to look at. Generally this will be the last run, but for this example we’ll pick an earlier, failed run.
Next, click on the “Details” link on the coverage run. If the run was a success you may need to scroll down to see the coverage build.
Next up, click on the warnings/errors link. For a successful coverage run, this will list zero errors/warnings but will still be clickable
On the azure results page, again click through to see results.
In this case the error reason was clear, and the directory missing coverage is listed. To get an understanding of what lines aren’t covered, you can browse further.
Scroll down on the left, and click on “Upload coverage reports” This will provide a link on the right, telling you where the coverage upload went, in this case a link to “https://storage.googleapis.com/envoy-pr/269d783/coverage/index.html” (which will only be valid for some number of days).
Clicking on the link provides a full color-annotated coverage report
You can browse this report to the directory in question. In this particular case the coverage issue was actually a coverage bug, where trailing braces in tested switch statements are considered uncovered lines. Generally this will instead provide a branch of code which simply needs unit tests.
