We've received monitoring alerts about high load and kernel panic messages in logs.
On checking the server, the load is high but without matching processes and it appears the kernel has panic'd to a degree which appears related.
Due to this, we will be rebooting the server in the next few minutes.
We apologise for the short notice and impact to your service.
Update: Reboot has completed and server working as expected. Thank you for your patience during the reboot.