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Aug 12, 2025
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[Pre7] Blazor diagnostics API updates #35772

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pavelsavara Jul 18, 2025
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pavelsavara Jul 21, 2025
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17 changes: 8 additions & 9 deletions aspnetcore/blazor/performance/index.md
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Expand Up @@ -56,13 +56,14 @@ For more information on the following performance meters, see <xref:log-mon/metr

`Microsoft.AspNetCore.Components` meter:

* `aspnetcore.components.navigation`: Tracks the total number of route changes in the app.
* `aspnetcore.components.event_handler`: Measures the duration of processing browser events, including business logic.
* `aspnetcore.components.navigate`: Tracks the total number of route changes in the app.
* `aspnetcore.components.handle_event.duration`: Measures the duration of processing browser events, including business logic.

`Microsoft.AspNetCore.Components.Lifecycle` meter:

* `aspnetcore.components.update_parameters`: Measures the duration of processing component parameters, including business logic.
* `aspnetcore.components.render_diff`: Tracks the duration of rendering batches.
* `aspnetcore.components.update_parameters.duration`: Measures the duration of processing component parameters, including business logic.
* `aspnetcore.components.render_diff.duration`: Tracks the duration of rendering batches.
* `aspnetcore.components.render_diff.size`: Tracks the size of rendering batches.

`Microsoft.AspNetCore.Components.Server.Circuits` meter:

Expand All @@ -80,7 +81,7 @@ The new activity tracing capabilities use the `Microsoft.AspNetCore.Components`

Circuit lifecycle tracing:

`Microsoft.AspNetCore.Components.CircuitStart`: Traces circuit initialization with the format `Circuit {circuitId}`.
`Microsoft.AspNetCore.Components.StartCircuit`: Traces circuit initialization with the format `Circuit {circuitId}`.

Tags:

Expand All @@ -96,7 +97,7 @@ Usage: Links other Blazor traces of the same session/circuit to HTTP and SignalR

Navigation tracing:

`Microsoft.AspNetCore.Components.RouteChange`: Tracks route changes with the format `Route {route} -> {componentType}`.
`Microsoft.AspNetCore.Components.Navigate`: Tracks route changes with the format `Route {route} -> {componentType}`.

Tags:

Expand All @@ -119,14 +120,12 @@ Event handling tracing:
Tags:

* `aspnetcore.components.attribute.name`: Name of the HTML attribute that triggers the event (example: `onClick`).
* `aspnetcore.components.method`: C# method name of the handler.
* `code.function.name`: C# method name of the handler.
* `aspnetcore.components.type`: Full name of target C# component that receives the event.
* `error.type`: Exception type full name (optional).

Links:

* HTTP trace
* SignalR trace
* Circuit trace
* Route trace

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