When running administrative processes under the unix "cron" facility you usually want them to generate output only in case of an error which needs the attention of a human, since any output from the process will cause a diagnostic email message to be sent to the owner of the job.
The MetadataFilterManager's command-line app has no way to turn off its status output, which is really only useful for debugging or interactive progress monitoring. The attached patch adds a --quiet option to disable these messages.
In practice, however, it's usually a lost cause to get the filters to run without any output because there are always some Items that fail. In the ideal case, however, a cron job would only generate diagnostic email when there is a new error that is worth the administrator's attention.
If you prefer quiet by default and the --verbose option to enable them, add a comment. (There already is a --verbose but it doesn't do much so it could be changed to --debug or conflated with this option).
Documentation would need a small update if this option is added.