Hi Dojo,
On a country visual we show the SLA severity and availability of each region.
Now we want to see the average of the whole country. This should be a weighted average by taking the number of inhabitants of each region in account.
How can we achieve this knowing that we want to show this weighted average value on the same visual and monitor it?
In case it's purely a matter of visualization, you could launch an automation script in the background whenever the Visio drawing is opened.
The script calculates the weighted SLA average and pushes it back into a session variable, which is then visualized.
In case you require monitoring, trending, etc... a custom driver is probably the only way, as indicated by Matthias.