As you might have noticed, on Wednesday, November 16, we experienced the problem with our own JetBrains YouTrack installation. The problem caused significant slowdown of the tracker and its further unavailability for users.
What went wrong
In our tracker we have a number of custom workflows, attached to different projects. Due to erroneous configuration, one of the workflow rules got into infinite loop while generating notifications, and started to increase loading of the server, which led to system's slowdown.
Fixing the problem
Being unable to stop executing the rule via UI, due to its u