The backend has crashed on a concurrency issue: https://gitlab.torproject.org/tpo/anti-censorship/rdsys/-/issues/234

I restarted it and seems to be back. But I'll find the source of the problem.

Quoting alertmanager@hetzner-nbg1-02.torproject.org (2024-09-23 06:25:51)

Total firing alerts: 1 Total resolved alerts: 0

## Firing Alerts

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Time: 2024-09-23 04:25:21.784 +0000 UTC Summary: Exporter job metrics-standard on rdsys-backend.torproject.org:443 is down Description: Exporter job metrics-standard on rdsys-backend.torproject.org:443 has been unreachable for more than 15 minutes.

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##Resolved Alerts