Quoting alertmanager@hetzner-nbg1-02.torproject.org (2023-08-01 19:18:35)

Time: 2023-08-01 17:17:51.034543026 +0000 UTC Summary: Too many bridgestrap failures Description: The percent of functional bridges is 0.0%.

Looks like bridgestrap got restarted ~55mins ago and that triggered this alert. Not sure why it got restarted, as the server was rebooted 1day ago. But as long as it doesn't happen again I'm happy to don't know.

We might want to tune the alert, so is not triggered by a short period of 0%, but I'll wait for this alert to happen again to do that.