Aggregation of data from multiple machines in to a single graph

[Ward, Martin]

Hi all,
 
I've had a dig around but have not found a solution to this problem, is it even possible?
 
I have a number of mail servers and I have tailored the Xymon client config on each server to return the number of emails in the deferred mail queue. What I would like is to have a single graph that displays all these values together (in the same way that it displays graph for all the different disks on a single server).  I know that the graphs can be created as I run an external command to generate the graphs and display them in a web page outside of Xymon. It would be nice to be able to have a configuration item for a given Xymon page and data value such that it creates an RRD graph for every server on that page which has that data value in its RRD file.
 
Any thoughts or suggestions as to how I might be able to show this?
 
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