Between late Friday evening (09-02-2024 CET) and Sunday morning (11-02-2024 CET) we had an outage of the forum.
The outage was triggered by a regular forum update from Discourse 3.1.3 to 3.2.0 performed on Friday evening.
The upgrade caused an incompatibility with the plugin for pushover notifications for iOS. This has been resolved by disabling the plugin until the plugin receives an update.
Thanks @benpicco for bringing the outage to my attention.