What is a good Rails logging solution?

Question

I am looking for a solution that will allow me to do advanced logging:

1. Unlimited log size
2. Ability to filter by priorities (debug/info/error)
3. Ability to filter by models/custom- tag
4. Ability to filter by user-sessions (see only errors for a specific session)
5. Should be able to work on Heroku
6. *Optional: Set rules to email/sms on certain high-priority errors

Either a tool that works with files and can easily diesct them, or a DB backed log storage.

Any suggestions are most welcome

Answer 1

Try Log4r first; if it doesn't do exactly what you need, it's pretty tweakable.