I finally heard from the server provider 8 hours after the issue started. Not in the form of a response to my support ticket, but instead just a mass automated email. There was a hardware issue with the VPS's hypervisor and our server was scheduled for migration 15 minutes ago, but yet still hasn't started the process.
If it's not clear, I'm very upset with the hosting provider. The entire service and subsequently the Glass Hosting business rely on their service to provide reliability, and having such a crippling issue occur for multiple servers going unnoticed for 8 hours from a company of this scale is ridiculous. On top of that, 5 hours of radio silence from their support team who could have likely resolved the issue with just a few mouse clicks.
I apologize for any inconvenience and will do my best to compensate to Glass Hosting clients after the service is restored.