Initial Symptom: When in a job's Configuration page, the loading mask was taking a very long time. Page rendering appeared to be halted at email-ext's "content token reference" help bubble. (Server CPU at 100% as well during this time) Once rendering appeared to progress past that bubble, everything returned to normal.
Expanding the content token reference help bubble shows the entire help reference duplicated many many times.
Server restart / recycle fixes the issue temporarily. As time goes on (not sure of specific event) you can see the amount of repeated content grow in repetitions. Somethings in JVM context not getting cleaned up maybe?
Attachments show approx length (this is shortly after reboot, things are stable. At its worst it was about 500+ pages.) and the specific content repetition.
Using jenkins 1.513, email-ext 2.30.2, token-macro 1.7