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semantic-conventions/docs/nfs/nfs-metrics.md

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<!--- Hugo front matter used to generate the website version of this page:
linkTitle: NFS
--->
# Semantic conventions for NFS metrics
**Status**: [Development][DocumentStatus]
This document describes instruments and attributes for NFS and NFSD metrics.
<!-- toc -->
- [NFS metrics](#nfs-metrics)
- [Metric: `nfs.client.net.count`](#metric-nfsclientnetcount)
- [Metric: `nfs.client.net.tcp.connection.accepted`](#metric-nfsclientnettcpconnectionaccepted)
- [Metric: `nfs.client.rpc.count`](#metric-nfsclientrpccount)
- [Metric: `nfs.client.rpc.retransmit.count`](#metric-nfsclientrpcretransmitcount)
- [Metric: `nfs.client.rpc.authrefresh.count`](#metric-nfsclientrpcauthrefreshcount)
- [Metric: `nfs.client.operation.count`](#metric-nfsclientoperationcount)
- [Metric: `nfs.client.procedure.count`](#metric-nfsclientprocedurecount)
- [NFSD metrics](#nfsd-metrics)
- [Metric: `nfs.server.repcache.requests`](#metric-nfsserverrepcacherequests)
- [Metric: `nfs.server.fh.stale.count`](#metric-nfsserverfhstalecount)
- [Metric: `nfs.server.io`](#metric-nfsserverio)
- [Metric: `nfs.server.thread.count`](#metric-nfsserverthreadcount)
- [Metric: `nfs.server.net.count`](#metric-nfsservernetcount)
- [Metric: `nfs.server.net.tcp.connection.accepted`](#metric-nfsservernettcpconnectionaccepted)
- [Metric: `nfs.server.rpc.count`](#metric-nfsserverrpccount)
- [Metric: `nfs.server.operation.count`](#metric-nfsserveroperationcount)
- [Metric: `nfs.server.procedure.count`](#metric-nfsserverprocedurecount)
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## NFS metrics
### Metric: `nfs.client.net.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.client.net.count` | Counter | `{record}` | Reports the count of kernel NFS client TCP segments and UDP datagrams handled. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel's svc_stat.netudpcnt and svc_stat.nettcpcnt
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`network.transport`](/docs/registry/attributes/network.md) | string | [OSI transport layer](https://wikipedia.org/wiki/Transport_layer) or [inter-process communication method](https://wikipedia.org/wiki/Inter-process_communication). [1] | `tcp`; `udp` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
**[1] `network.transport`:** The value SHOULD be normalized to lowercase.
Consider always setting the transport when setting a port number, since
a port number is ambiguous without knowing the transport. For example
different processes could be listening on TCP port 12345 and UDP port 12345.
---
`network.transport` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
| Value | Description | Stability |
|---|---|---|
| `pipe` | Named or anonymous pipe. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| `quic` | QUIC | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| `tcp` | TCP | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| `udp` | UDP | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
| `unix` | Unix domain socket | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
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### Metric: `nfs.client.net.tcp.connection.accepted`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.client.net.tcp.connection.accepted` | Counter | `{connection}` | Reports the count of kernel NFS client TCP connections accepted. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel's svc_stat.nettcpconn
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### Metric: `nfs.client.rpc.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.client.rpc.count` | Counter | `{request}` | Reports the count of kernel NFS client RPCs sent, regardless of whether they're accepted/rejected by the server. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel's svc_stat.rpccnt
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### Metric: `nfs.client.rpc.retransmit.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.client.rpc.retransmit.count` | Counter | `{retransmit}` | Reports the count of kernel NFS client RPC retransmits. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel's svc_stat.rpcretrans
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### Metric: `nfs.client.rpc.authrefresh.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.client.rpc.authrefresh.count` | Counter | `{authrefresh}` | Reports the count of kernel NFS client RPC authentication refreshes. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel's svc_stat.rpcauthrefresh
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### Metric: `nfs.client.operation.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.client.operation.count` | Counter | `{operation}` | Reports the count of kernel NFSv4+ client operations. | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`nfs.operation.name`](/docs/registry/attributes/nfs.md) | string | NFSv4+ operation name. | `OPEN`; `READ`; `GETATTR` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`onc_rpc.version`](/docs/registry/attributes/onc-rpc.md) | int | ONC/Sun RPC program version. | | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
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### Metric: `nfs.client.procedure.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.client.procedure.count` | Counter | `{procedure}` | Reports the count of kernel NFS client procedures. | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`onc_rpc.procedure.name`](/docs/registry/attributes/onc-rpc.md) | string | ONC/Sun RPC procedure name. | `OPEN`; `READ`; `GETATTR` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`onc_rpc.version`](/docs/registry/attributes/onc-rpc.md) | int | ONC/Sun RPC program version. | | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
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## NFSD metrics
### Metric: `nfs.server.repcache.requests`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.repcache.requests` | Counter | `{request}` | Reports the kernel NFS server reply cache request count by cache hit status. | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`nfs.server.repcache.status`](/docs/registry/attributes/nfs.md) | string | Linux: one of "hit" (NFSD_STATS_RC_HITS), "miss" (NFSD_STATS_RC_MISSES), or "nocache" (NFSD_STATS_RC_NOCACHE -- uncacheable) | `hit` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
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### Metric: `nfs.server.fh.stale.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.fh.stale.count` | Counter | `{fh}` | Reports the count of kernel NFS server stale file handles. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel NFSD_STATS_FH_STALE counter in the nfsd_net struct
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### Metric: `nfs.server.io`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.io` | Counter | `By` | Reports the count of kernel NFS server bytes returned to receive and transmit (read and write) requests. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel NFSD_STATS_IO_READ and NFSD_STATS_IO_WRITE counters in the nfsd_net struct
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`network.io.direction`](/docs/registry/attributes/network.md) | string | The network IO operation direction. | `transmit` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
---
`network.io.direction` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
| Value | Description | Stability |
|---|---|---|
| `receive` | receive | ![Development](https://img.shields.io/badge/-development-blue) |
| `transmit` | transmit | ![Development](https://img.shields.io/badge/-development-blue) |
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### Metric: `nfs.server.thread.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.thread.count` | UpDownCounter | `{thread}` | Reports the count of kernel NFS server available threads. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel nfsd_th_cnt variable
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### Metric: `nfs.server.net.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.net.count` | Counter | `{record}` | Reports the count of kernel NFS server TCP segments and UDP datagrams handled. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel's svc_stat.nettcpcnt and svc_stat.netudpcnt
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### Metric: `nfs.server.net.tcp.connection.accepted`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.net.tcp.connection.accepted` | Counter | `{connection}` | Reports the count of kernel NFS server TCP connections accepted. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel's svc_stat.nettcpconn
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### Metric: `nfs.server.rpc.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.rpc.count` | Counter | `{request}` | Reports the count of kernel NFS server RPCs handled. [1] | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
**[1]:** Linux: this metric is taken from the Linux kernel's svc_stat.rpccnt, the count of good RPCs. This metric can have
an error.type of "format", "auth", or "client" for svc_stat.badfmt, svc_stat.badauth, and svc_stat.badclnt.
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`error.type`](/docs/registry/attributes/error.md) | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | `Recommended` | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
**[1] `error.type`:** The `error.type` SHOULD be predictable, and SHOULD have low cardinality.
When `error.type` is set to a type (e.g., an exception type), its
canonical class name identifying the type within the artifact SHOULD be used.
Instrumentations SHOULD document the list of errors they report.
The cardinality of `error.type` within one instrumentation library SHOULD be low.
Telemetry consumers that aggregate data from multiple instrumentation libraries and applications
should be prepared for `error.type` to have high cardinality at query time when no
additional filters are applied.
If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.
If a specific domain defines its own set of error identifiers (such as HTTP or gRPC status codes),
it's RECOMMENDED to:
- Use a domain-specific attribute
- Set `error.type` to capture all errors, regardless of whether they are defined within the domain-specific set or not.
---
`error.type` has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.
| Value | Description | Stability |
|---|---|---|
| `_OTHER` | A fallback error value to be used when the instrumentation doesn't define a custom value. | ![Stable](https://img.shields.io/badge/-stable-lightgreen) |
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### Metric: `nfs.server.operation.count`
This metric is [recommended][MetricRecommended].
<!-- semconv metric.nfs.server.operation.count -->
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.operation.count` | Counter | `{operation}` | Reports the count of kernel NFSv4+ server operations. | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`nfs.operation.name`](/docs/registry/attributes/nfs.md) | string | NFSv4+ operation name. | `OPEN`; `READ`; `GETATTR` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`onc_rpc.version`](/docs/registry/attributes/onc-rpc.md) | int | ONC/Sun RPC program version. | | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
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<!-- endsemconv -->
### Metric: `nfs.server.procedure.count`
This metric is [recommended][MetricRecommended].
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| Name | Instrument Type | Unit (UCUM) | Description | Stability | Entity Associations |
| -------- | --------------- | ----------- | -------------- | --------- | ------ |
| `nfs.server.procedure.count` | Counter | `{procedure}` | Reports the count of kernel NFS server procedures. | ![Development](https://img.shields.io/badge/-development-blue) | [`host`](/docs/registry/entities/host.md#host) |
| Attribute | Type | Description | Examples | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`onc_rpc.procedure.name`](/docs/registry/attributes/onc-rpc.md) | string | ONC/Sun RPC procedure name. | `OPEN`; `READ`; `GETATTR` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`onc_rpc.version`](/docs/registry/attributes/onc-rpc.md) | int | ONC/Sun RPC program version. | | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
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<!-- endsemconv -->
[MetricRecommended]: /docs/general/metric-requirement-level.md#recommended
[DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status
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