user:sync --quiet should log errors to the console

[butonic]

When syncing 100k users from ldap on the CLI the admin should see some feedback when a user property could not be mapped (eg the email could not be determined). Currently we only log this to the logfile.

It should also produce output on the CLI so that running the sync command with --quiet in a cron job can be used to notify the admin via email when there is a problem. Cron won't send an email if the output wis empty, which is why --quiet is important to work correctly.

[ownclouders]

GitMate.io thinks possibly related issues are #26902 (error), #28840 (-Error-), #29082 (a Error), #11622 (Calendar Sync in Thunderbird Errors), and #12143 (owncloud.log flooded with errors).

[mmattel]

If there will be a PR filed for this, a documentation note is necessary, just as a reminder 😄

[stale]

This issue has been automatically closed.