dist-stddev

Input Stack:
Query
Output Stack:
TimeSeriesExpr

Compute the standard deviation for timers and distribution summaries.

A manual query would look like:

statistic,count,:eq,
:sum,
statistic,totalOfSquares,:eq,
:sum,
:mul,
statistic,totalTime,:eq,
:sum,
:dup,
:mul,
:sub,
statistic,count,:eq,
:sum,
:dup,
:mul,
:div,
:sqrt,
nf.cluster,foo,:eq,
 name,http.req.latency,:eq,
:and,
:cq

This is much simpler using the :dist-stddev function:

nf.cluster,foo,:eq,
name,http.req.latency,:eq,
:and,
:dist-stddev
BeforeAfter
name,playback.startLatency,:eq
name,playback.startLatency,:eq,
:dist-stddev