eval
The delta operator evaluates a time series based on a user-specified math expression.
Evaluates a time series based on a user-specified math expression.
eval syntax
metrics query | eval <math expression>
where <math expression> is a valid math expression with _value as the placeholder for each data point in the time series.
Supported Basic operations:
+, -, *, /
Supported Math functions:
sin, cos, abs, log, round, ceil, floor, tan, exp, sqrt, min, max
Eval examples
Multiply a metric
This query returns the value of the cpu_idle metric, multiplied by 100.
_sourceCategory=ApacheHttpServer metrics=cpu_idle | eval _value * 10
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