@filhalbate to identify the date and time of a Jamf Pro server update in the log files, you can navigate to the "jamf.log" file located in the "/var/log/jamf" directory on your Jamf Pro server. Look for entries related to the server update, which may include lines specifying the update process or version changes. Additionally, you can check the "jss_startup.log" file in the same directory for information regarding the Jamf Pro server startup, which might indicate an update occurrence.
jamf man
