I'd like to suggest a new field to all EventLogging tables - 'productionwiki' - it's a boolean that is true if an event is logged for a wiki that we have marked as being production.
I spend a lot of time filtering out local wikis, test wiki and various others. For one given table for instance I have to filter out the following web hosts to make sure my data is more accurate:
incubator.m.wikimedia.org 3
localhost.alpha 34
localhost.beta 24
localhost.m 1
<external host url i don't know about> 2
Version: unspecified
Severity: enhancement