Today I've received a pulse message for group GpA3Vr0RSPeeGv7wi7uM3Q, whose tasks were all resolved on 2017-07-11. This is just an example, but it actually happened for other old groups as well. A few days ago, I was basically never seeing duplicate messages or messages coming from very old tasks. Now, it's happening really often.

Are these for re-runs of tasks from those groups?

I've printed the 'resolved' property of all task runs: > for task in tasks: > for run in task['status']['runs']: > print(run['resolved']) And all of them were resolved on 2017-07-11, so I think they weren't re-runs.

I think from listing the task group just now there were three tasks that resolved on 2017-08-03. Specifically YfA9Siv4R2e66LQ3WZ1-GA, LezTcOpJTGCWlZchCxOF6A, and YS_mOrLXQNSlk_UJHaENMQ. Interestingly it looks like task UOdLkEzGRUWKQQ8FjGfGYg resolved at 2018-02-03T16:25:25.743Z which is just last month? I will close this as a dupe of bug 1443503 so that we can continue discussion in there. I'm thinking that maybe we need to provide some sort of other mechanism other than taskGroupResolved for your use case.