Recording Hostname of server handling hit - for cluster nodes

Drupal records PHP errors in it's logs. If it's only one server, it's obvious which server handles the hit, but in a cluster's environment, it could be any number of servers, the more there are, the longer it can take to track down a PHP error on an individual server.

I'm proposing checking the server's Hostname using environment variables:

$_ENV["HOSTNAME"]

And recording that in the log, with PHP error entries, to aid in tracking down errors on sites due to problems with an individual node on a site. This is also good information to give to an ISP if you have managed hosting as well. =)

-Myke