wgDBName is enwiki on http://en.wikipedia.beta.wmflabs.org/wiki/Main_Page , so that's the wiki that gets reported.
You can distinguish client-side events generated on the beta labs cluster because the webHost is en.wikipedia.beta.wmflabs.org.
In server-side events webHost is NULL (as is clientIp), so it's not obvious how to distinguish.
Version: unspecified
Severity: normal