You can shorten the name of the logger using %logger{x} syntax where x controls shortening procedure. Is there any way to shorten the name of the thread the same way?
[%.7thread]
This will print the last 7 characters of the thread name.
Trailing characters of a thread name are often more interesting than the characters at the beginning of a thread name. :-)
You may read about the maximum field width modifier in the logback docs.