cPanel & WHM 11.32 includes a new feature called Update Analysis that records update (upcp) information on individual servers and reports back to cPanel.
After upcp runs, the update analysis process, /usr/local/cpanel/scripts/gather-update-logs, performs checks to confirm a successful update. Then, this process stores the update information as tarball files in /usr/local/cpanel/logs/update_analysis.
These tarball files will only be deleted if you opt out of reporting the update information to cPanel. You can enable or disable reporting update information to cPanel from WHM > Tweak Settings > Send update analyses to cPanel. If reporting update information to cPanel is currently disabled, you can also enable this option from the Send Update Analysis to cPanel notification box in one of 2 locations:
WHM > Update Preferences
WHM > Upgrade to Latest Version