fix(metrics): Monitor for clients sending obsolete contentToken parameter.
fix(metrics): Monitor for clients sending obsolete contentToken parameter.

eoger/fxa-auth-server,shane-tomlinson/fxa-auth-server,mozilla/fxa-auth-server,TDA/fxa-auth-server,mozilla/fxa-auth-server,shane-tomlinson/fxa-auth-server,mozilla/fxa-auth-server,TDA/fxa-auth-server,mozilla/fxa-auth-server,shane-tomlinson/fxa-auth-server,eoger/fxa-auth-server,eoger/fxa-auth-server,TDA/fxa-auth-server,TDA/fxa-auth-server,eoger/fxa-auth-server,shane-tomlinson/fxa-auth-server