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semantic-conventions/docs/hardware/fan.md

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<!--- Hugo front matter used to generate the website version of this page:
linkTitle: Fan
--->
# Semantic conventions for fan metrics
**Status**: [Development][DocumentStatus]
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- [Fan metrics `hw.fan.*`](#fan-metrics-hwfan)
- [Metric: `hw.fan.speed`](#metric-hwfanspeed)
- [Metric: `hw.fan.speed.limit`](#metric-hwfanspeedlimit)
- [Metric: `hw.fan.speed_ratio`](#metric-hwfanspeed_ratio)
- [Metric: `hw.status` (Fan)](#metric-hwstatus-fan)
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## Fan metrics `hw.fan.*`
Fan that keeps the air flowing to maintain the internal temperature of a computer.
`hw.type` MUST be set to `"fan"`.
All fan metrics may include the below attributes:
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| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`hw.id`](/docs/registry/attributes/hardware.md) | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.name`](/docs/registry/attributes/hardware.md) | string | An easily-recognizable name for the hardware component | `eth0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.parent`](/docs/registry/attributes/hardware.md) | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.sensor_location`](/docs/registry/attributes/hardware.md) | string | Location of the sensor | `cpu0`; `ps1`; `INLET`; `CPU0_DIE`; `AMBIENT`; `MOTHERBOARD`; `PS0 V3_3`; `MAIN_12V`; `CPU_VCORE` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
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### Metric: `hw.fan.speed`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `hw.fan.speed` | Gauge | `rpm` | Fan speed in revolutions per minute. | ![Development](https://img.shields.io/badge/-development-blue) | |
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`hw.id`](/docs/registry/attributes/hardware.md) | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.name`](/docs/registry/attributes/hardware.md) | string | An easily-recognizable name for the hardware component | `eth0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.parent`](/docs/registry/attributes/hardware.md) | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.sensor_location`](/docs/registry/attributes/hardware.md) | string | Location of the sensor | `cpu0`; `ps1`; `INLET`; `CPU0_DIE`; `AMBIENT`; `MOTHERBOARD`; `PS0 V3_3`; `MAIN_12V`; `CPU_VCORE` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
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### Metric: `hw.fan.speed.limit`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `hw.fan.speed.limit` | Gauge | `rpm` | Speed limit in rpm. | ![Development](https://img.shields.io/badge/-development-blue) | |
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`hw.id`](/docs/registry/attributes/hardware.md) | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.limit_type`](/docs/registry/attributes/hardware.md) | string | Type of limit for hardware components | `low.critical`; `low.degraded`; `max` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.name`](/docs/registry/attributes/hardware.md) | string | An easily-recognizable name for the hardware component | `eth0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.parent`](/docs/registry/attributes/hardware.md) | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.sensor_location`](/docs/registry/attributes/hardware.md) | string | Location of the sensor | `cpu0`; `ps1`; `INLET`; `CPU0_DIE`; `AMBIENT`; `MOTHERBOARD`; `PS0 V3_3`; `MAIN_12V`; `CPU_VCORE` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
---
`hw.limit_type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
| Value | Description | Stability |
|---|---|---|
| `critical` | Critical | ![Development](https://img.shields.io/badge/-development-blue) |
| `degraded` | Degraded | ![Development](https://img.shields.io/badge/-development-blue) |
| `high.critical` | High Critical | ![Development](https://img.shields.io/badge/-development-blue) |
| `high.degraded` | High Degraded | ![Development](https://img.shields.io/badge/-development-blue) |
| `low.critical` | Low Critical | ![Development](https://img.shields.io/badge/-development-blue) |
| `low.degraded` | Low Degraded | ![Development](https://img.shields.io/badge/-development-blue) |
| `max` | Maximum | ![Development](https://img.shields.io/badge/-development-blue) |
| `throttled` | Throttled | ![Development](https://img.shields.io/badge/-development-blue) |
| `turbo` | Turbo | ![Development](https://img.shields.io/badge/-development-blue) |
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### Metric: `hw.fan.speed_ratio`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `hw.fan.speed_ratio` | Gauge | `1` | Fan speed expressed as a fraction of its maximum speed. | ![Development](https://img.shields.io/badge/-development-blue) | |
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`hw.id`](/docs/registry/attributes/hardware.md) | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.name`](/docs/registry/attributes/hardware.md) | string | An easily-recognizable name for the hardware component | `eth0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.parent`](/docs/registry/attributes/hardware.md) | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.sensor_location`](/docs/registry/attributes/hardware.md) | string | Location of the sensor | `cpu0`; `ps1`; `INLET`; `CPU0_DIE`; `AMBIENT`; `MOTHERBOARD`; `PS0 V3_3`; `MAIN_12V`; `CPU_VCORE` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
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### Metric: `hw.status` (Fan)
This metric is [recommended][MetricRecommended].
Operational status: `1` (true) or `0` (false) for each of the possible states.
When using this metric for fan status, the following attributes MUST be set:
- `hw.type` MUST be set to `"fan"` to indicate that the status is for a fan.
- `hw.state` MUST be set to one of the following values to indicate the fan state:
- `"ok"`: The fan is operating normally.
- `"degraded"`: The fan is operating with reduced functionality or performance.
- `"failed"`: The fan has failed and is not operational.
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `hw.status` | UpDownCounter | `1` | Operational status: `1` (true) or `0` (false) for each of the possible states. [1] | ![Development](https://img.shields.io/badge/-development-blue) | |
**[1]:** `hw.status` is currently specified as an *UpDownCounter* but would ideally be represented using a [*StateSet* as defined in OpenMetrics](https://github.com/prometheus/OpenMetrics/blob/v1.0.0/specification/OpenMetrics.md#stateset). This semantic convention will be updated once *StateSet* is specified in OpenTelemetry. This planned change is not expected to have any consequence on the way users query their timeseries backend to retrieve the values of `hw.status` over time.
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`hw.id`](/docs/registry/attributes/hardware.md) | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.state`](/docs/registry/attributes/hardware.md) | string | The current state of the component | `degraded`; `failed`; `needs_cleaning` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.type`](/docs/registry/attributes/hardware.md) | string | Type of the component [1] | `battery`; `cpu`; `disk_controller` | `Required` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.name`](/docs/registry/attributes/hardware.md) | string | An easily-recognizable name for the hardware component | `eth0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`hw.parent`](/docs/registry/attributes/hardware.md) | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
**[1] `hw.type`:** Describes the category of the hardware component for which `hw.state` is being reported. For example, `hw.type=temperature` along with `hw.state=degraded` would indicate that the temperature of the hardware component has been reported as `degraded`.
---
`hw.state` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
| Value | Description | Stability |
|---|---|---|
| `degraded` | Degraded | ![Development](https://img.shields.io/badge/-development-blue) |
| `failed` | Failed | ![Development](https://img.shields.io/badge/-development-blue) |
| `needs_cleaning` | Needs Cleaning | ![Development](https://img.shields.io/badge/-development-blue) |
| `ok` | OK | ![Development](https://img.shields.io/badge/-development-blue) |
| `predicted_failure` | Predicted Failure | ![Development](https://img.shields.io/badge/-development-blue) |
---
`hw.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
| Value | Description | Stability |
|---|---|---|
| `battery` | Battery | ![Development](https://img.shields.io/badge/-development-blue) |
| `cpu` | CPU | ![Development](https://img.shields.io/badge/-development-blue) |
| `disk_controller` | Disk controller | ![Development](https://img.shields.io/badge/-development-blue) |
| `enclosure` | Enclosure | ![Development](https://img.shields.io/badge/-development-blue) |
| `fan` | Fan | ![Development](https://img.shields.io/badge/-development-blue) |
| `gpu` | GPU | ![Development](https://img.shields.io/badge/-development-blue) |
| `logical_disk` | Logical disk | ![Development](https://img.shields.io/badge/-development-blue) |
| `memory` | Memory | ![Development](https://img.shields.io/badge/-development-blue) |
| `network` | Network | ![Development](https://img.shields.io/badge/-development-blue) |
| `physical_disk` | Physical disk | ![Development](https://img.shields.io/badge/-development-blue) |
| `power_supply` | Power supply | ![Development](https://img.shields.io/badge/-development-blue) |
| `tape_drive` | Tape drive | ![Development](https://img.shields.io/badge/-development-blue) |
| `temperature` | Temperature | ![Development](https://img.shields.io/badge/-development-blue) |
| `voltage` | Voltage | ![Development](https://img.shields.io/badge/-development-blue) |
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[DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status
[MetricRecommended]: /docs/general/metric-requirement-level.md#recommended
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