replace static subject with summary of content
DocTor's emails have a static subject "Consensus issues", lets make the subject more useful:
- mention the highest loglevel (WARNING, NOTICE, ...) contained in the mail
- mention the type of problems detected
- mention the amount of problems per type detected
the subject for this email: https://lists.torproject.org/pipermail/tor-consensus-health/2018-February/008491.html
would look something like:
warning: certexpiry (2), hsdir disagreement (1), badexit disagreement (1)