The site just recovered from a temporary outage, and I want to share some details on what happened.
It appears that there was an issue with a change they made in server configuration on Monday that caused one of the servers to gradually run out of memory.
The site's monitoring alerted me (and the hosting company's support team) to the situation immediately.
Unfortunately, they were a little slower than usual to respond to this situation, so the outage went on longer than I would have liked. I was at work, so it took me a little while before I was able to get on the phone with them to get them started on working on resolving the problem.
Once I had them on the phone, they resolved the issue within 15 minutes.
I'll be working with the support team to try to better understand the factors that led to the outage, and also what can be done to improve their response time on a similar issue in the future.
Hopefully, we won't see a reoccurrence of an issue like this again anytime soon, but if we do, I have alternative hosting arrangements I can explore.