Documentation

stateDuration() function

stateDuration() returns the cumulative duration of a given state.

The state is defined by the fn predicate function. For each consecutive record that evaluates to true, the state duration is incremented by the duration of time between records using the specified unit. When a record evaluates to false, the value is set to -1 and the state duration is reset. If the record generates an error during evaluation, the point is discarded, and does not affect the state duration.

The state duration is added as an additional column to each record. The duration is represented as an integer in the units specified.

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

Function type signature
(
    <-tables: stream[A],
    fn: (r: A) => bool,
    ?column: string,
    ?timeColumn: string,
    ?unit: duration,
) => stream[B] where A: Record, B: Record

For more information, see Function type signatures.

Parameters

fn

(Required) Predicate function that identifies the state of a record.

column

Column to store the state duration in. Default is stateDuration.

timeColumn

Time column to use to calculate elapsed time between rows. Default is _time.

unit

Unit of time to use to increment state duration. Default is 1s (seconds).

Example units:

  • 1ns (nanoseconds)
  • 1us (microseconds)
  • 1ms (milliseconds)
  • 1s (seconds)
  • 1m (minutes)
  • 1h (hours)
  • 1d (days)

tables

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

Examples

Return the time spent in a specified state

import "sampledata"

sampledata.int()
    |> stateDuration(fn: (r) => r._value < 15)

View example input and output


Was this page helpful?

Thank you for your feedback!


The future of Flux

Flux is going into maintenance mode. You can continue using it as you currently are without any changes to your code.

Read more

InfluxDB v3 enhancements and InfluxDB Clustered is now generally available

New capabilities, including faster query performance and management tooling advance the InfluxDB v3 product line. InfluxDB Clustered is now generally available.

InfluxDB v3 performance and features

The InfluxDB v3 product line has seen significant enhancements in query performance and has made new management tooling available. These enhancements include an operational dashboard to monitor the health of your InfluxDB cluster, single sign-on (SSO) support in InfluxDB Cloud Dedicated, and new management APIs for tokens and databases.

Learn about the new v3 enhancements


InfluxDB Clustered general availability

InfluxDB Clustered is now generally available and gives you the power of InfluxDB v3 in your self-managed stack.

Talk to us about InfluxDB Clustered