RageDump is an addon which basically warns you (using the error frame) when you reached a rage threshold.
You can see the commands in game by typing /ragedump help.
Note: This addon will not work if you disabled your error frame (with the help of other addons)
Note 2: Does not work for druids yet.
Changes in v1.1 :
-- Slash commands added
-- Set your own message
-- Set your own threshold
-- Set the fadetime of your message
-- Message now appears in error frame