There was an unexcepted outtake of the Hetzner Load-Balancers in Falkenstein.
Our monitoring system detects this outtake and alarms immediatly.

Hetzner informs about a maintenance of the UPS system:
https://status.hetzner.com/incident/a6ae4acb-87ff-4e34-9de5-9e6e9e988a82
No issue were expect from Hetzner.

Between 11:25 and 11:30 the Staging Load-Balancers failed communicating to our Application Servers.

Between 11:45 and 11:50 the Production Load-Balancers failed communicating to our Application Servers.

The situation has been stabilized.
Our technicals install a backup Load-Balancer in a different location to avoid upcoming issues.