# Semantic conventions for physical host metrics

LLMS index: [llms.txt](/llms.txt)

---

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


## 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) | |

**Attributes:**

| Key | Stability | [Requirement Level](/docs/specs/semconv/general/attribute-requirement-level/) | Value Type | Description | Example Values |
| --- | --- | --- | --- | --- | --- |
| [`hw.id`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Required` | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` |
| [`hw.name`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Recommended` | string | An easily-recognizable name for the hardware component | `eth0` |
| [`hw.parent`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Recommended` | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` |

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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.

**Attributes:**

| Key | Stability | [Requirement Level](/docs/specs/semconv/general/attribute-requirement-level/) | Value Type | Description | Example Values |
| --- | --- | --- | --- | --- | --- |
| [`hw.id`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Required` | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` |
| [`hw.name`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Recommended` | string | An easily-recognizable name for the hardware component | `eth0` |
| [`hw.parent`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Recommended` | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` |

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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) | |

**Attributes:**

| Key | Stability | [Requirement Level](/docs/specs/semconv/general/attribute-requirement-level/) | Value Type | Description | Example Values |
| --- | --- | --- | --- | --- | --- |
| [`hw.id`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Required` | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` |
| [`hw.name`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Recommended` | string | An easily-recognizable name for the hardware component | `eth0` |
| [`hw.parent`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Recommended` | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` |

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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.

**Attributes:**

| Key | Stability | [Requirement Level](/docs/specs/semconv/general/attribute-requirement-level/) | Value Type | Description | Example Values |
| --- | --- | --- | --- | --- | --- |
| [`hw.id`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Required` | string | An identifier for the hardware component, unique within the monitored host | `win32battery_battery_testsysa33_1` |
| [`hw.name`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Recommended` | string | An easily-recognizable name for the hardware component | `eth0` |
| [`hw.parent`](/docs/specs/semconv/registry/attributes/hardware.md) | ![Development](https://img.shields.io/badge/-development-blue) | `Recommended` | string | Unique identifier of the parent component (typically the `hw.id` attribute of the enclosure, or disk controller) | `dellStorage_perc_0` |

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