I’m using an Influx data source and
I often display data which is calculated with simple arithmetic expressions from the fields of a measurement, like differences or ratios. A simple example for a difference is
SELECT mean("dtq_50")-mean("dtq_min") FROM "TfcMonitor" WHERE ("host" =~ /^$host$/) AND $timeFilter GROUP BY time($__interval), "host", "oid" fill(null)
which gives combined with an
ALIAS BY rule of
$tag_host $tag_oid the data I want.
Simple to write down as
math option seems only good for scale factors.
I wonder whether there is a way to generate such expressions with the query editor.