filter() function filters data based on conditions defined in a predicate function (
The output tables have the same schema as the corresponding input tables.
Function type: Transformation
Output data type: Object
filter(fn: (r) => r._measurement == "cpu")
A single argument function that evaluates true or false. Records are passed to the function. Those that evaluate to true are included in the output tables.
Data type: Function
Objects evaluated in
fnfunctions are represented by
r, short for “record” or “row”.
from(bucket:"telegraf/autogen") |> range(start:-1h) |> filter(fn: (r) => r._measurement == "cpu" and r._field == "usage_system" and r.cpu == "cpu-total" )