stateDuration() function

The stateDuration() function computes the duration of a given state. The state is defined via the function fn. For each consecutive point for that evaluates as true, the state duration will be incremented by the duration between points. When a point evaluates as false, the state duration is reset. The state duration is added as an additional column to each record.

As the first point in the given state has no previous point, its state duration will be 0.

stateDuration(fn: (r) => r._measurement == "state", column: "stateDuration", unit: 1s)

If the expression generates an error during evaluation, the point is discarded, and does not affect the state duration.


Make sure fn parameter names match each specified parameter. To learn why, see Match parameter names.


(Required) A single argument function that evaluates true or false to identify the state of the record. Records are passed to the function. Those that evaluate to true increment the state duration. Those that evaluate to false reset the state duration.


Name of the column added to each record that contains the state duration. Default is stateDuration.


Unit of time to increment state duration with. For example: 1s, 1m, 1h, etc. Default is one second (1s).


Input data. Default is piped-forward data (<-).


The following example uses data provided by the sampledata package to show how stateDuration() transforms data.

import "sampledata"
    |> stateDuration(fn: (r) => r._value > 10)

View input and output

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