Hi, I had added this to the Issue queue, not sure it got much exposure.. here is the link to the issue:

http://drupal.org/node/355296

Basically, I had a problem where a single node in the cluster was generating PHP errors when none of the other nodes were. I think this could easily be solved by recording the HOSTNAME environment variable into the watchdog logs, have this as an optional feature maybe for those running behind clusters to be able to find failing cluster nodes?

If one host in the cluster was consistently giving PHP errors while not the others, then this could indicate that node was having problems... WITHOUT having to dig through server logs...

-Myke