docs-v2/content/flux/v0/stdlib/influxdata/influxdb/monitor/statechangesonly.md

title	description	menu	weight	flux/v0/tags	introduced
monitor.stateChangesOnly() function	`monitor.stateChangesOnly()` takes a stream of tables that contains a _level column and returns a stream of tables grouped by `_level` where each record represents a state change.	flux_v0_ref name parent identifier monitor.stateChangesOnly influxdata/influxdb/monitor influxdata/influxdb/monitor/stateChangesOnly	301	transformations	0.65.0

monitor.stateChangesOnly() takes a stream of tables that contains a _level column and returns a stream of tables grouped by _level where each record represents a state change.

Function type signature

(<-tables: stream[{A with _level: B}]) => stream[C] where B: Equatable, C: Record

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Parameters

tables

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

Examples

Return records representing state changes

import "array"
import "influxdata/influxdb/monitor"

data =
    array.from(
        rows: [
            {_time: 2021-01-01T00:00:00Z, _level: "ok"},
            {_time: 2021-01-01T00:01:00Z, _level: "ok"},
            {_time: 2021-01-01T00:02:00Z, _level: "warn"},
            {_time: 2021-01-01T00:03:00Z, _level: "crit"},
        ],
    )

data
    |> monitor.stateChangesOnly()

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Input data

_time	_level
2021-01-01T00:00:00Z	ok
2021-01-01T00:01:00Z	ok
2021-01-01T00:02:00Z	warn
2021-01-01T00:03:00Z	crit

Output data

_time	*_level
2021-01-01T00:03:00Z	crit

_time	*_level
2021-01-01T00:02:00Z	warn

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