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Add process.disk.operations metric to semantic conventions #2845

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Add process.disk.operations metric to semantic conventions #2845

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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -31,6 +31,8 @@ release.
([#2874](https://github.com/open-telemetry/opentelemetry-specification/pull/2874))
- Add `process.paging.faults` metric to semantic conventions
([#2827](https://github.com/open-telemetry/opentelemetry-specification/pull/2827))
- Add `process.disk.operations` metric to semantic conventions
([#2845](https://github.com/open-telemetry/opentelemetry-specification/pull/2845))

### Compatibility

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1 change: 1 addition & 0 deletions specification/metrics/semantic_conventions/process-metrics.md
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Expand Up @@ -38,6 +38,7 @@ Below is a table of Process metric instruments.
| `process.memory.usage` | UpDownCounter | By | The amount of physical memory in use. | |
| `process.memory.virtual` | UpDownCounter | By | The amount of committed virtual memory. | |
| `process.disk.io` | Counter | By | Disk bytes transferred. | `direction` SHOULD be one of: `read`, `write` |
| `process.disk.operations` | Counter | {operations} | Number of disk operations performed by the process | `direction` SHOULD be one of: `read`, `write` |
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What about "control" (e.g. seek, S.M.A.R.T. signal)?

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I like how this is inline with process.disk.io, w/ direction being either read or write. I suspect SMART capabilities would need their own metric(s). I don't how to address seek.

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There are lots and back-and-forth, e.g. #2617.

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@reyang I do recognize that this has been a much-discussed topic:

The current state is that metrics very similar to the proposed process.disk.operations metric exist in the semantic conventions in the same shape as the proposed metric (with the "direction" attribute of either "read" or "write"):

This proposal adds the process.disk.operations metric that is related to process.disk.io in the same was that the system.disk.operations is related to system.disk.io metric. I believe this is not a controversial change and there's no reason to not add this metric in the current shape.

If you want the discuss the shape of these metrics, I'd say it's better to open a separate issue.

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I believe this is not a controversial change and there's no reason to not add this metric in the current shape.

I have different understanding - we already know the existing ones are wrong and will take breaking changes before they can be marked stable, it'll be better to avoid adding more things that require a fix.

| `process.network.io` | Counter | By | Network bytes transferred. | `direction` SHOULD be one of: `receive`, `transmit` |
| `process.threads` | UpDownCounter | {threads} | Process threads count. | |
| `process.open_file_descriptors` | UpDownCounter | {count} | Number of file descriptors in use by the process. | |
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