iterate over multiple values

[Finkregh]

trafficstars

It would be great if i could paint multiple values in the same way without having to add everything on its own.

Example: i have a metric like disk_used_pct for N hosts. At the moment i have to add line for every single host.

before:
disk_used_pct_host1(host1) --> A
disk_used_pct_host2(host2) --> A

after:
{for each: disk_used_pct_*} --> A

[bigkraig]

I think this relates closely with #28