From Github you may access Ceph API tests results in Jenkins by clicking in "Details" and you'll see a report:
1. The test may fail due to multiple causes: issues in a Jenkins node, Github repo fetching, "make" stage, ... (if this is the case you may easily retrigger the Ceph API test by adding a comment to the PR with the text "jenkins test api").
2. If the failure actually happens as a result of the Ceph API tests themselves, the report will look
like this:
From there: