If your just trying to get at the data go directly to the source and skip the webserver. Not sure which database your using as a backend I'd guess Mysql. I'd consider querying it directly for statistics using the SQL sensors. You listed (open tickets) so my assumption is you want to build a sql expression using the sensor to lift a total number of open tickets.
I don't know if the sensor would graph a numerical expression but you could always give it a go.
Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.