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# Semantic conventions for physical host metrics

**Status**: [Development][DocumentStatus]

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- [Physical host metrics `hw.host.*`](#physical-host-metrics-hwhost)
  - [Metric: `hw.host.ambient_temperature`](#metric-hwhostambient_temperature)
  - [Metric: `hw.host.energy`](#metric-hwhostenergy)
  - [Metric: `hw.host.heating_margin`](#metric-hwhostheating_margin)
  - [Metric: `hw.host.power`](#metric-hwhostpower)

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## Physical host metrics `hw.host.*`

Physical system as opposed to a virtual system or a container.
Examples: physical server, switch or disk array.

### Metric: `hw.host.ambient_temperature`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `hw.host.ambient_temperature` | Gauge | `Cel` | Ambient (external) temperature of the physical host. | ![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) |

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### Metric: `hw.host.energy`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `hw.host.energy` | Counter | `J` | Total energy consumed by the entire physical host, in joules. [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** The overall energy usage of a host MUST be reported using the specific `hw.host.energy` and `hw.host.power` metrics **only**, instead of the generic `hw.energy` and `hw.power` described in the previous section, to prevent summing up overlapping values.

| 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) |

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### Metric: `hw.host.heating_margin`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `hw.host.heating_margin` | Gauge | `Cel` | By how many degrees Celsius the temperature of the physical host can be increased, before reaching a warning threshold on one of the internal sensors. | ![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) |

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### Metric: `hw.host.power`

This metric is [recommended][MetricRecommended].

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| Name     | Instrument Type | Unit (UCUM) | Description    | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `hw.host.power` | Gauge | `W` | Instantaneous power consumed by the entire physical host in Watts (`hw.host.energy` is preferred). [1] | ![Development](https://img.shields.io/badge/-development-blue) |  |

**[1]:** The overall energy usage of a host MUST be reported using the specific `hw.host.energy` and `hw.host.power` metrics **only**, instead of the generic `hw.energy` and `hw.power` described in the previous section, to prevent summing up overlapping values.

| 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) |

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[DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status
[MetricRecommended]: /docs/general/metric-requirement-level.md#recommended
