How to query for "all but one" in graphite/grafana

Question

I'm playing with grafana and I want to create a panel where I compare data from one app server against the average of all the others except that one. Something like:

apps.machine1.someMetric
averageSeries(apps.*.not(machine1).someMetric)

Can that be done? How?

Answer 1

Sounds like you want to filter a seriesList, you an do that inclusively using the 'grep' function or exclusively using the 'exclude' function

exclude(apps.machine*.someMetric,"machine1")

and pass that into averageSeries

averageSeries(exclude(apps.machine*.someMetric,"machine1"))

You can read more about those functions here: http://graphite.readthedocs.io/en/latest/functions.html#graphite.render.functions.exclude

Answer 2

After reading the Graphite URL API docs section about wildcard paths I don't think there is any "all but one" target query. However if you don't have many machines you can list all them but the excluded one in your query:

apps.machine1.someMetric
averageSeries(apps.{machine2,machine3,machine4,machine5}.someMetric)

Or use a character range:

apps.machine1.someMetric
averageSeries(apps.machine[2-5].someMetric)