As detailed in T287510, we want to add console output when running mwscript extensions/MediaModeration/maintenance/ModerateExistingFiles.php with a verbose flag.
The expected output would be a message that the script is starting, dots for each batch run, and then an ending message which already exists.
If it seems simple and doable, timestamps for failures or matches might also be useful to add with a verbose flag.
See https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MediaModeration/+/769074/ for an example of how to add output.