edits from Scott and Will
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@ -13,7 +13,7 @@ weight: 209
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Flux helps you monitor states in your metrics and events:
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- [Find how long a state persists](#find-how-long-a-state-persists)
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- [Count the number of states](#count-the-number-of-states)
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- [Count the number of consecutive states](#count-the-number-of-consecutive-states)
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- [Detect state changes](#detect-state-changes)
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If you're just getting started with Flux queries, check out the following:
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@ -23,32 +23,38 @@ If you're just getting started with Flux queries, check out the following:
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## Find how long a state persists
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1. Use the `stateDuration()` function and include the following information:
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1. Use the `stateDuration()` function to calculate how long a column value has remained the same value (or state). This function requires the following information:
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- **Column to search:** any tag key, tag value, field key, field value, or measurement.
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- **Value:** value (or state) to search for in the specified column.
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- **Value:** the value (or state) to search for in the specified column.
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- **State duration column:** a new column to store the state duration─the length of time the specified value persists.
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- **Unit:** of time to measure the state duration (`1s` (by default), `1m`, `1h`).
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- **Unit:** the unit of time (`1s` (by default), `1m`, `1h`) used to increment the state duration.
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```bash
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|> stateDuration(fn: (r) => r._column_to_search == "value_to_search_for", column: "state_duration", unit: 1s
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```js
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|> stateDuration(fn: (r) =>
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r._column_to_search == "value_to_search_for",
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column: "state_duration",
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unit: 1s)
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```
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2. Run `stateDuration()` to search each point in the specified time range for the specified value:
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2. Run `stateDuration()` to search each point for the specified value:
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- For the first point that evaluates `true`, the state duration is set to `0`. For each consecutive point that evaluates `true`, the state duration increases by the time interval between each consecutive point (in specified units).
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- If the state is `false`, the state duration is reset to `-1`.
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### Example query with stateDuration()
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<!-- once we have multiple example queries,link to multiple examples here with sub-descriptors -->
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The following query searches the `doors` bucket over the past 5 minutes to find how many seconds a door has been `closed`.
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```bash
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```js
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from(bucket: "doors")
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|> range(start: -5m)
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|> stateDuration(fn: (r) => r._value == "closed", column: "door_closed", unit: 1s)
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|> stateDuration(fn: (r) =>
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r._value == "closed",
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column: "door_closed",
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unit: 1s)
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```
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In this example, `door_closed` is the **State duration** column. If you write data to the `doors` bucket every minute, the state duration increases by `60s` for each consecutive point where `_value` is `closed`. If `_value` is not `closed`, the state duration is reset to `0`.
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@ -67,7 +73,7 @@ _time _value door_closed
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2019-10-26T17:44:27Z closed 60
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```
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## Count the number of states
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## Count the number of consecutive states
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1. Use the `stateCount()` function and include the following information:
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@ -75,9 +81,14 @@ _time _value door_closed
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- **Value:** to search for in the specified column.
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- **State count column:** a new column to store the state count─the number of consecutive records in which the specified value exists.
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`|> stateCount(fn: (r) => r._column_to_search == "value_to_search_for", column: "state_count"`
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```js
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`|> stateCount(fn: (r) =>
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r._column_to_search == "value_to_search_for",
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column: "state_count"`
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)
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```
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2. Run `stateCount()` to search each point in the specified time range for the specified value:
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2. Run `stateCount()` to search each point for the specified value:
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- For the first point that evaluates `true`, the state count is set to `1`. For each consecutive point that evaluates `true`, the state count increases by 1.
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- If the state is `false`, the state count is reset to `-1`.
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@ -86,11 +97,12 @@ _time _value door_closed
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The following query searches the `doors` bucket over the past 5 minutes to find how many points have been counted where `_value` is `closed`.
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```bash
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```js
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from(bucket: "doors")
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|> range(start: -5m)
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|> stateDuration(fn: (r) => r._value == "closed", column: "door_closed")
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|> stateDuration(fn: (r) =>
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r._value == "closed",
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column: "door_closed")
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```
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In this example, `door_closed` is the **State count** column. If you write data to the `doors` bucket every minute, the state count increases by `1` for each consecutive point where `_value` is `closed`. If `_value` is not `closed`, the state count is reset to `-1`.
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@ -129,9 +141,9 @@ In this query, InfluxDB searches the `servers` bucket over the past hour, counts
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## Detect state changes
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Detect state changes with the `monitor.stateChanges()` function. To use the `monitor.stateChanges()` function, you must have set up a **check** to query data (stored in the `_monitoring` bucket > `statuses` measurement > `_level` column; see [Monitor data and send alerts](v2.0/monitor-alert/) for more detail.
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Detect state changes with the `monitor.stateChanges()` function. To use the `monitor.stateChanges()` function, you must set up a **check** to query data (stored in the `_monitoring` bucket > `statuses` measurement > `_level` column; see [Monitor data and send alerts](v2.0/monitor-alert/) for more detail.
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1. In Cloud, click **Monitoring and Alerting** icon from the sidebar.
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1. In Cloud, click the **Monitoring and Alerting** icon from the sidebar.
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{{< nav-icon "alerts" >}}
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@ -145,7 +157,7 @@ Detect state changes with the `monitor.stateChanges()` function. To use the `mon
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### Example query with monitor.stateChanges()
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```bash
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```js
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import "influxdata/influxdb/monitor"
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from ${ r._check_name}`
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