Grafana dividing 2 series

Question

I\'m trying to divide 2 series to get their ratio. For example I\'m got sites (a.com, b.com, c.com) as * (All sites) Each of them has total sections count and errors occurre

Answer 1

A new function divideSeriesLists was introduced in Graphite 1.0.2 for dividing one series with another. Both the series should be of same length.

Answer 2

You can use mapSeries with divideSeries to do vector matching of series in Graphite (or maybe asPercent depending on which version of graphite you are using).

An example query:

aliasByNode(reduceSeries(mapSeries(groupByNodes(parser.*.{sections,errors}.total, 'maxSeries', 1, 2), 0), 'asPercent', 1, 'sections', 'errors'), 0)

I'm not sure what aggregation function you are using so substitute maxSeries for the function you need.

Check out this blog post about using mapSeries with divideSeries for more explanation.

Here is an example from our system in the Grafana query editor: