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Add additional process metrics to the metrics semantic conventions (#2706)
Co-authored-by: Armin Ruech <armin.ruech@dynatrace.com>
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‎CHANGELOG.md

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### Semantic Conventions
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- Add `process.context_switches`, and `process.open_file_descriptors`, to the
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metrics semantic conventions
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([#2706](https://github.com/open-telemetry/opentelemetry-specification/pull/2706))
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### Compatibility
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### OpenTelemetry Protocol

‎specification/metrics/semantic_conventions/process-metrics.md

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Below is a table of Process metric instruments.
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| Name | Instrument Type ([*](README.md#instrument-types)) | Units | Description | Labels |
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|---------------------------|---------------------------------------------------|-------|-------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `process.cpu.time` | Counter | s | Total CPU seconds broken down by different states. | `state`, if specified, SHOULD be one of: `system`, `user`, `wait`. A process SHOULD be characterized _either_ by data points with no `state` labels, _or only_ data points with `state` labels. |
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| `process.cpu.utilization` | Gauge | 1 | Difference in process.cpu.time since the last measurement, divided by the elapsed time and number of CPUs available to the process. | `state`, if specified, SHOULD be one of: `system`, `user`, `wait`. A process SHOULD be characterized _either_ by data points with no `state` labels, _or only_ data points with `state` labels. |
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| `process.memory.usage` | UpDownCounter | By | The amount of physical memory in use. | |
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| `process.memory.virtual` | UpDownCounter | By | The amount of committed virtual memory. | |
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| `process.disk.io` | Counter | By | Disk bytes transferred. | `direction` SHOULD be one of: `read`, `write` |
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| `process.network.io` | Counter | By | Network bytes transferred. | `direction` SHOULD be one of: `receive`, `transmit` |
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| `process.threads` | UpDownCounter | {threads} | Process threads count. | |
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| Name | Instrument Type ([\*](README.md#instrument-types)) | Unit | Description | Labels |
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| -------------------------------------- | -------------------------------------------------- | --------- | ----------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| `process.cpu.time` | Counter | s | Total CPU seconds broken down by different states. | `state`, if specified, SHOULD be one of: `system`, `user`, `wait`. A process SHOULD be characterized _either_ by data points with no `state` labels, _or only_ data points with `state` labels. |
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| `process.cpu.utilization` | Gauge | 1 | Difference in process.cpu.time since the last measurement, divided by the elapsed time and number of CPUs available to the process. | `state`, if specified, SHOULD be one of: `system`, `user`, `wait`. A process SHOULD be characterized _either_ by data points with no `state` labels, _or only_ data points with `state` labels. |
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| `process.memory.usage` | UpDownCounter | By | The amount of physical memory in use. | |
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| `process.memory.virtual` | UpDownCounter | By | The amount of committed virtual memory. | |
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| `process.disk.io` | Counter | By | Disk bytes transferred. | `direction` SHOULD be one of: `read`, `write` |
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| `process.network.io` | Counter | By | Network bytes transferred. | `direction` SHOULD be one of: `receive`, `transmit` |
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| `process.threads` | UpDownCounter | {threads} | Process threads count. | |
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| `process.open_file_descriptors` | UpDownCounter | {count} | Number of file descriptors in use by the process. | |
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| `process.context_switches` | Counter | {count} | Number of times the process has been context switched. | `type` SHOULD be one of: `involuntary`, `voluntary` |
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## Attributes
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