89 lines
5.4 KiB
Markdown
89 lines
5.4 KiB
Markdown
<!--- Hugo front matter used to generate the website version of this page:
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linkTitle: SignalR
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--->
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# Semantic Conventions for SignalR server metrics
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**Status**: [Stable][DocumentStatus]
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This article defines semantic conventions for SignalR metrics emitted by .NET components and runtime.
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<!-- toc -->
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- [Metric: `signalr.server.connection.duration`](#metric-signalrserverconnectionduration)
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- [Metric: `signalr.server.active_connections`](#metric-signalrserveractive_connections)
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<!-- tocstop -->
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## Metric: `signalr.server.connection.duration`
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this metric SHOULD be specified with
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[`ExplicitBucketBoundaries`](https://github.com/open-telemetry/opentelemetry-specification/tree/v1.26.0/specification/metrics/api.md#instrument-advisory-parameters)
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of `[ 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 30, 60, 120, 300 ]`.
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<!-- semconv metric.signalr.server.connection.duration(metric_table) -->
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| Name | Instrument Type | Unit (UCUM) | Description | Stability |
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| -------- | --------------- | ----------- | -------------- | --------- |
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| `signalr.server.connection.duration` | Histogram | `s` | The duration of connections on the server. [1] |  |
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**[1]:** Meter name: `Microsoft.AspNetCore.Http.Connections`; Added in: ASP.NET Core 8.0
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<!-- endsemconv -->
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<!-- semconv metric.signalr.server.connection.duration(full) -->
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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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| `signalr.connection.status` | string | SignalR HTTP connection closure status. | `app_shutdown`; `timeout` | `Recommended` |  |
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| `signalr.transport` | string | [SignalR transport type](https://github.com/dotnet/aspnetcore/blob/main/src/SignalR/docs/specs/TransportProtocols.md) | `web_sockets`; `long_polling` | `Recommended` |  |
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`signalr.connection.status` MUST be one of the following:
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| Value | Description | Stability |
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|---|---|---|
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| `normal_closure` | The connection was closed normally. |  |
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| `timeout` | The connection was closed due to a timeout. |  |
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| `app_shutdown` | The connection was closed because the app is shutting down. |  |
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`signalr.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.
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| Value | Description | Stability |
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|---|---|---|
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| `server_sent_events` | ServerSentEvents protocol |  |
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| `long_polling` | LongPolling protocol |  |
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| `web_sockets` | WebSockets protocol |  |
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<!-- endsemconv -->
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## Metric: `signalr.server.active_connections`
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<!-- semconv metric.signalr.server.active_connections(metric_table) -->
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| Name | Instrument Type | Unit (UCUM) | Description | Stability |
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| -------- | --------------- | ----------- | -------------- | --------- |
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| `signalr.server.active_connections` | UpDownCounter | `{connection}` | Number of connections that are currently active on the server. [1] |  |
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**[1]:** Meter name: `Microsoft.AspNetCore.Http.Connections`; Added in: ASP.NET Core 8.0
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<!-- endsemconv -->
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<!-- semconv metric.signalr.server.active_connections(full) -->
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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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| `signalr.connection.status` | string | SignalR HTTP connection closure status. | `app_shutdown`; `timeout` | `Recommended` |  |
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| `signalr.transport` | string | [SignalR transport type](https://github.com/dotnet/aspnetcore/blob/main/src/SignalR/docs/specs/TransportProtocols.md) | `web_sockets`; `long_polling` | `Recommended` |  |
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`signalr.connection.status` MUST be one of the following:
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| Value | Description | Stability |
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| `normal_closure` | The connection was closed normally. |  |
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| `timeout` | The connection was closed due to a timeout. |  |
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| `app_shutdown` | The connection was closed because the app is shutting down. |  |
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`signalr.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.
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| Value | Description | Stability |
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|---|---|---|
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| `server_sent_events` | ServerSentEvents protocol |  |
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| `long_polling` | LongPolling protocol |  |
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| `web_sockets` | WebSockets protocol |  |
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<!-- endsemconv -->
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[DocumentStatus]: https://github.com/open-telemetry/opentelemetry-specification/tree/v1.26.0/specification/document-status.md
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