Used memory should be based on operating system's internals (#2534)
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Roger Coll
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# Use this changelog template to create an entry for release notes.
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#
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# If your change doesn't affect end users you should instead start
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# your pull request title with [chore] or use the "Skip Changelog" label.
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# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
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change_type: enhancement
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# The name of the area of concern in the attributes-registry, (e.g. http, cloud, db)
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component: system
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# A brief description of the change. Surround your text with quotes ("") if it needs to start with a backtick (`).
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note: Used memory should be based on operating system's internals
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# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
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# The values here must be integers.
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issues: [2534]
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# (Optional) One or more lines of additional information to render under the primary note.
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# These lines will be padded with 2 spaces and then inserted directly into the document.
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# Use pipe (|) for multiline entries.
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subtext:
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@ -69,7 +69,9 @@ Describes System Memory attributes
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| `buffers` | buffers |  |
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| `cached` | cached |  |
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| `free` | free |  |
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| `used` | used |  |
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| `used` | Actual used virtual memory in bytes. [1] |  |
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**[1]:** Calculation based on the operating system metrics. On Linux, this corresponds to "MemTotal - MemAvailable" from /proc/meminfo, which more accurately reflects memory in active use by applications compared to older formulas based on free, cached, and buffers. If MemAvailable is not available, a fallback to those older formulas may be used.
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## System Paging Attributes
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@ -272,10 +272,7 @@ This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
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| -------- | --------------- | ----------- | -------------- | --------- | ------ |
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| `system.memory.usage` | UpDownCounter | `By` | Reports memory in use by state. [1] |  | [`host`](/docs/registry/entities/host.md#host) |
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**[1]:** The sum over all `system.memory.state` values SHOULD equal the total memory
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available on the system, that is `system.memory.limit`.
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| `system.memory.usage` | UpDownCounter | `By` | Reports memory in use by state. |  | [`host`](/docs/registry/entities/host.md#host) |
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| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
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|---|---|---|---|---|---|
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@ -290,7 +287,9 @@ available on the system, that is `system.memory.limit`.
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| `buffers` | buffers |  |
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| `cached` | cached |  |
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| `free` | free |  |
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| `used` | used |  |
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| `used` | Actual used virtual memory in bytes. [1] |  |
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**[1]:** Calculation based on the operating system metrics. On Linux, this corresponds to "MemTotal - MemAvailable" from /proc/meminfo, which more accurately reflects memory in active use by applications compared to older formulas based on free, cached, and buffers. If MemAvailable is not available, a fallback to those older formulas may be used.
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<!-- markdownlint-restore -->
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<!-- prettier-ignore-end -->
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@ -310,9 +309,7 @@ This metric is [opt-in][MetricOptIn].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
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| -------- | --------------- | ----------- | -------------- | --------- | ------ |
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| `system.memory.limit` | UpDownCounter | `By` | Total memory available in the system. [1] |  | [`host`](/docs/registry/entities/host.md#host) |
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**[1]:** Its value SHOULD equal the sum of `system.memory.state` over all states.
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| `system.memory.limit` | UpDownCounter | `By` | Total virtual memory available in the system. |  | [`host`](/docs/registry/entities/host.md#host) |
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<!-- markdownlint-restore -->
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<!-- prettier-ignore-end -->
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@ -370,7 +367,9 @@ This metric is [recommended][MetricRecommended].
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| `buffers` | buffers |  |
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| `cached` | cached |  |
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| `free` | free |  |
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| `used` | used |  |
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| `used` | Actual used virtual memory in bytes. [1] |  |
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**[1]:** Calculation based on the operating system metrics. On Linux, this corresponds to "MemTotal - MemAvailable" from /proc/meminfo, which more accurately reflects memory in active use by applications compared to older formulas based on free, cached, and buffers. If MemAvailable is not available, a fallback to those older formulas may be used.
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<!-- markdownlint-restore -->
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<!-- prettier-ignore-end -->
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@ -105,9 +105,6 @@ groups:
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metric_value_type: int
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stability: development
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brief: "Reports memory in use by state."
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note: |
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The sum over all `system.memory.state` values SHOULD equal the total memory
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available on the system, that is `system.memory.limit`.
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instrument: updowncounter
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unit: "By"
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attributes:
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@ -122,9 +119,7 @@ groups:
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code_generation:
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metric_value_type: int
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stability: development
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brief: "Total memory available in the system."
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note: |
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Its value SHOULD equal the sum of `system.memory.state` over all states.
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brief: "Total virtual memory available in the system."
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instrument: updowncounter
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unit: "By"
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attributes: []
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@ -22,6 +22,13 @@ groups:
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- id: used
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value: 'used'
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stability: development
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brief: Actual used virtual memory in bytes.
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note: >
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Calculation based on the operating system metrics.
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On Linux, this corresponds to "MemTotal - MemAvailable" from /proc/meminfo, which
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more accurately reflects memory in active use by applications compared to older
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formulas based on free, cached, and buffers. If MemAvailable is not available,
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a fallback to those older formulas may be used.
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- id: free
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value: 'free'
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stability: development
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