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I had just a problem today. I am working two issues with the same root 
cause. I want to add a single message to both issues to tell the respective 
people that the problem was solved.

This is currently not 
possible in either the email or web interfaces, but I think bulk ticket 
actions are needed. I know I used them often in RT and other 
systems.

Also there is no "merge" functionality that would help 
mitigate, but not eliminate this issue.

-- rouilj