Improved support for mostDeviant function

[jbraeuer]

The mostDeviant function in graphite is currently poorly supported. I use it to graph the "top5 tenants" or alike. However gdash forces to give a name in the field-function, so the legend of the graph shows 5-times the same name.

It would be really cool to see this function properly supported.

[bwhaley]

Gdash supports Graphite's aliasSub function that solves this problem. For instance, in one of my .graph files I have

field :systemlog, :data  => "mostDeviant(5,nonNegativeDerivative(keepLastValue(servers.[acrpf]*ca*.filesize.derive-system_log.value)))",
  :alias_sub_search  => '^.*servers.([0-9a-z_-]*)\..*$',
  :alias_sub_replace => '\1'

This will submatch in the mostDeviant target list for servers.some-alphanumeric_servername and use that in the legend.

[jbraeuer]

Thanks! This should do it indeed.