Following the update from Messaging Gateway 10.6.6 to 10.7.1 or later the update.log file and messages log show warnings and errors following the update but the update appears to have been completed without issue.
update.log grubby fatal error: unable to find a suitable template messages log 2019 May 28 10:40:53 (warning) kernel: [65783.426319] systemd-tmpfiles[10940]: Failed to fstat() file /var: Invalid argument 2019 May 28 10:40:53 (warning) kernel: [65783.426342] systemd-tmpfiles[10940]: Failed to fstat() file /var/run/sepermit: Invalid argument 2019 May 28 10:40:53 (warning) kernel: [65783.426380] systemd-tmpfiles[10940]: Failed to fstat() file /run/lock: Invalid argument
These messages are associated with transient events during the update process and can be safely ignored.