TestHangingNotifier is flaky on windows #16615
Description
First saw it on https://github.com/prometheus/prometheus/actions/runs/14931598411
then on main https://github.com/prometheus/prometheus/actions/runs/15108680391/job/42462961125
2025-05-19T09:03:35.6521434Z === RUN TestHangingNotifier
2025-05-19T09:03:35.6521835Z manager_test.go:848:
2025-05-19T09:03:35.6522569Z Error Trace: D:/a/prometheus/prometheus/notifier/manager_test.go:848
2025-05-19T09:03:35.6523320Z Error: "0" is not positive%!(EXTRA int=0)
2025-05-19T09:03:35.6523847Z Test: TestHangingNotifier
2025-05-19T09:03:35.6525005Z Messages: The faulty alertmanager wasn't dropped before the alerts queue was emptied.
2025-05-19T09:03:35.6525714Z --- FAIL: TestHangingNotifier (0.14s)
maybe the test depended on the locking order before #16587 and needs to be adjusted