The package is Online/TESTracer and can be found in svn at:

svn+ssh://svn.cern.ch/reps/lhcb/OnlineExtra/trunk/Online/TESTracer

The package should be built in order to produce the library: libTESTracer.so The library should be preloaded to make override symbols from Gaudi:

setenv LD_PRELOAD ~/cmtuser/Brunel_v44r5/TESTracer/x86_64-slc6-gcc46-opt/libTESTracer.so 

And the option file must be modified to add the new Auditor:

AuditorSvc().Auditors.append("TES::TraceAuditor")

See the example in cmt/testROOT.py