Since we moved to pytest 4.0, we have warnings summary at the end of the build. Here is example summary: *00:10:06.166* =============================== warnings summary ===============================*00:10:06.167* /home/jenkins/workspace/vdsm_master_check-patch-fc28-x86_64/vdsm/lib/vdsm/storage/mailbox.py:73*00:10:06.168* /home/jenkins/workspace/vdsm_master_check-patch-fc28-x86_64/vdsm/lib/vdsm/storage/mailbox.py:73: DeprecationWarning: fromstring() is deprecated. Use frombytes() instead.*00:10:06.171* _zeroCheck = checksum(EMPTYMAILBOX, CHECKSUM_BYTES) ... You can see complete warnings here: https://jenkins.ovirt.org/job/vdsm_master_check-patch-fc28-x86_64/2413/co... We have only few warnings, but they are repeated a lot. Nir