GWC building tiles with requests failing at KVP parsing causes control-flow to lock up
The sentinel machinery ends up trying to remove the wrong token from the queues.
It's probably best to redesign the sentinel around a servlet filter, so that even requests failing hard cannot prevent the release of the control tokens
Mass closing all resolved issues not modified in the last 4 weeks
Fixed in master and 2.9, unsure about a backport to 2.8.x