After receiving many alerts, it seems a hypervisor is down. We are working on getting it back up.
EDIT 21:30 UTC : The hypervisor is now responding after an hard reboot. We are currently ensuring that every virtual machines in a healthy state and investigating the HV crash root cause.
EDIT 22:00 UTC: Every VM on the hypervisor are running as expected, the root cause was a kernel panic (the kernel is now in a more stable version)