add_instrumentation filter breaks JS execution on XHTML files

[GoogleCodeExporter]

Not sure about the whole instrumentation thinggy.
Added it, checked out the messages, checked out the stats, nice but not needed.

- will this be improved in future versions? in its current state this is quite 
pointless except for quick debugging...

Also, adding instrumentation breaks my munin generated stats, check it out live 
here: 
http://zice.ro/munin/serverkompetenz.net/h1870666.serverkompetenz.net/index.html

Error at the top of the page says: 

"This page contains the following errors:
error on line 409 at column 130: EntityRef: expecting ';'
Below is a rendering of the page up to the first error."

Disabling instrumentation removes the error.

Original issue reported on code.google.com by ovi...@pacura.ru on 2 Apr 2012 at 12:16