When I posted that I had it set to be archived on the 26th. Since you posted this on the 28th, this had already been archived.
The machine is still heavily overloaded though. I don't know if it's been like this for a while, or if it's a recent phenomenon.
The several postmaster backends are using upwards of 90% of the CPU, the biggest culprit being the same notifications query.
The load average is over 4.5, and quite a chunk of used memory is swapped.
We need to upgrade the site yesterday. I can start working on this upgrade on Thrusday. Anyone else that can help?
-Roberto