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[chrismd <question70836@xxxxxxxxxxxxxxxxxxxxx>]

Question #70836 on Graphite changed:
https://answers.launchpad.net/graphite/+question/70836

    Status: Open => Answered

chrismd proposed the following answer:
Yes this functionality is supported, though unfortunately the
documentation is lacking right now. Here's the easiest way to do this:

Say for example you have three servers you are tracking the loadavg_1min
metric for, each named like so:

servers.server1.loadavg_1min
servers.server2.loadavg_1min
servers.server3.loadavg_1min

You can get an average of the loadavg_1min metric across all three of
these servers by using a URL of the form:

http://my-graphite-
server/render?target=averageSeries(servers.*.loadavg_1min)

Unfortunately it is not very obvious how to do this from the web
interface because it actually (currently) requires LDAP authentication
to be setup (because it requires a profile-specific setting to be
enabled, yada yada yada, ... I really need to fix this). Anyways if you
do have authentication setup and you log in you should see a "(edit
profile)" link in the top frame, click that and enable "Advanced UI
settings", this will cause a special "*" node to be present beneath
every branch node in the browser tree and it behaves just like "*" in a
filesystem path (because that's actually what it is). By using "*" at
branch nodes you can render multiple metrics within a single target and
using the 'Targets' dialog off the main window you can apply functions
(such as averageSeries) to the group of matching metrics.

Anyways, long story short I will definitely make this an option you can
use without LDAP authentication in the next release. For now the easiest
approach is to manually manipulate your graph's URL. A lot of people
tend to embed graphite images by URL within other web pages rather than
always directly using graphite's web interface anyways, so if you do
that this isn't that big of a deal.

I hope that helps.

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