/usr/local/bin/foreachwiki extensions/Echo/maintenance/processEchoEmailBatch.php is apparently sending an email to root from terbium from cron with several "Echo isn't enabled on this wiki".
Maybe something has to change on puppet that is outdated concerning mediawiki config? Maybe Echo has been disabled on some wikis recently? Maybe this error always happened?
If everything is ok, then make sure no daily emails are sent for spam.