diff --git a/docs/dotnet/README.md b/docs/dotnet/README.md
index 7e6c2f8f82..f3bc37f094 100644
--- a/docs/dotnet/README.md
+++ b/docs/dotnet/README.md
@@ -18,3 +18,4 @@ The following metrics are currently supported:
 * [Kestrel](dotnet-kestrel-metrics.md): Semantic Conventions for Kestrel web server *metrics*.
 * [SignalR](dotnet-signalr-metrics.md): Semantic Conventions for SignalR server *metrics*.
 * [Runtime](/docs/runtime/dotnet-metrics.md): Semantic conventions for .NET Runtime *metrics*.
+* [Blazor](dotnet-blazor-metrics.md): Semantic Conventions for Blazor UI framework *metrics*.
diff --git a/docs/dotnet/dotnet-blazor-metrics.md b/docs/dotnet/dotnet-blazor-metrics.md
new file mode 100644
index 0000000000..fb4e6b6880
--- /dev/null
+++ b/docs/dotnet/dotnet-blazor-metrics.md
@@ -0,0 +1,8 @@
+# Semantic conventions for Blazor UI framework
+
+**Status**: [Development][DocumentStatus]
+
+This article defines semantic conventions for Blazor metrics emitted by .NET components.
+
+<!-- semconv metric.aspnetcore.components.navigate -->
+<!-- endsemconv -->
diff --git a/model/aspnetcore/metrics.yaml b/model/aspnetcore/metrics.yaml
index d24b7ffc54..e9bb241df9 100644
--- a/model/aspnetcore/metrics.yaml
+++ b/model/aspnetcore/metrics.yaml
@@ -135,3 +135,130 @@ groups:
     attributes:
       - ref: aspnetcore.rate_limiting.result
         requirement_level: required
+
+  # blazor components
+  - id: metric.aspnetcore.components.navigate
+    type: metric
+    metric_name: aspnetcore.components.navigate
+    stability: development
+    brief: Total number of route changes.
+    instrument: counter
+    unit: "{route}"
+    note: >
+      Meter name: `Microsoft.AspNetCore.Components`; Added in: ASP.NET Core 10.0
+      More about [Blazor routing](https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/routing)
+    attributes:
+      - ref: aspnetcore.components.type
+        requirement_level: required
+      - ref: aspnetcore.components.route
+        requirement_level: required
+
+  - id: metric.aspnetcore.components.handle_event.duration
+    type: metric
+    metric_name: aspnetcore.components.handle_event.duration
+    stability: development
+    brief: Duration of processing browser event handler.
+    instrument: histogram
+    unit: "s"
+    note: >
+      Meter name: `Microsoft.AspNetCore.Components`; Added in: ASP.NET Core 10.0
+      More about [Blazor event handling](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/event-handling)
+    attributes:
+      - ref: aspnetcore.components.type
+        requirement_level: required
+      - ref: code.function.name
+        requirement_level: required
+      - ref: aspnetcore.components.attribute.name
+        requirement_level: required
+      - ref: error.type
+        brief: The full name of exception type.
+        examples: ['System.OperationCanceledException', 'Contoso.MyException']
+        requirement_level:
+          conditionally_required: If handler has ended with an error.
+
+  - id: metric.aspnetcore.components.update_parameters.duration
+    type: metric
+    metric_name: aspnetcore.components.update_parameters.duration
+    stability: development.duration
+    brief: Duration of processing component parameters.
+    instrument: histogram
+    unit: "s"
+    note: >
+      Meter name: `Microsoft.AspNetCore.Components.Lifecycle`; Added in: ASP.NET Core 10.0
+      More about [Blazor parameters](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/cascading-values-and-parameters)
+    attributes:
+      - ref: aspnetcore.components.type
+        requirement_level: required
+      - ref: error.type
+        brief: The full name of exception type.
+        examples: ['System.OperationCanceledException', 'Contoso.MyException']
+        requirement_level:
+          conditionally_required: If handler has ended with an error.
+
+  - id: metric.aspnetcore.components.render_diff.duration
+    type: metric
+    metric_name: aspnetcore.components.render_diff.duration
+    stability: development
+    brief: Duration of rendering difference batch between previous and current HTML.
+    instrument: histogram
+    unit: "s"
+    note: >
+      Meter name: `Microsoft.AspNetCore.Components.Lifecycle`; Added in: ASP.NET Core 10.0
+      More about [Blazor rendering](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/rendering)
+    attributes:
+      - ref: error.type
+        brief: The full name of exception type.
+        examples: ['System.OperationCanceledException', 'Contoso.MyException']
+        requirement_level:
+          conditionally_required: If handler has ended with an error.
+
+  - id: metric.aspnetcore.components.render_diff.size
+    type: metric
+    metric_name: aspnetcore.components.render_diff.size
+    stability: development
+    brief: Size of rendering difference batch between previous and current HTML.
+    instrument: histogram
+    unit: "element"
+    note: >
+      Meter name: `Microsoft.AspNetCore.Components.Lifecycle`; Added in: ASP.NET Core 10.0
+      More about [Blazor rendering](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/rendering)
+    attributes:
+      - ref: error.type
+        brief: The full name of exception type.
+        examples: ['System.OperationCanceledException', 'Contoso.MyException']
+        requirement_level:
+          conditionally_required: If handler has ended with an error.
+
+  # Blazor circuits
+  - id: metric.aspnetcore.components.circuit.duration
+    type: metric
+    metric_name: aspnetcore.components.circuit.duration
+    stability: development
+    brief: Duration of circuit including time after re-connect.
+    instrument: histogram
+    unit: "s"
+    note: >
+      Meter name: `Microsoft.AspNetCore.Components.Server.Circuits`; Added in: ASP.NET Core 10.0
+      More about [Blazor circuits](https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/signalr)
+
+  - id: metric.aspnetcore.components.circuit.active
+    type: metric
+    metric_name: aspnetcore.components.circuit.active
+    stability: development
+    brief: Number of circuits in memory, both connected and waiting for re-connect.
+    instrument: updowncounter
+    unit: "{circuit}"
+    note: >
+      Meter name: `Microsoft.AspNetCore.Components.Server.Circuits`; Added in: ASP.NET Core 10.0
+      More about [Blazor circuits](https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/signalr)
+
+  - id: metric.aspnetcore.components.circuit.connected
+    type: metric
+    metric_name: aspnetcore.components.circuit.connected
+    stability: development
+    brief: Number of connected circuits.
+    instrument: updowncounter
+    unit: "{circuit}"
+    note: >
+      Meter name: `Microsoft.AspNetCore.Components.Server.Circuits`; Added in: ASP.NET Core 10.0
+      More about [Blazor circuits](https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/signalr)
diff --git a/model/aspnetcore/registry.yaml b/model/aspnetcore/registry.yaml
index 71677d5980..ed6713e4a6 100644
--- a/model/aspnetcore/registry.yaml
+++ b/model/aspnetcore/registry.yaml
@@ -83,3 +83,33 @@ groups:
         stability: stable
         brief: ASP.NET Core exception middleware handling result
         examples: ["handled", "unhandled"]
+      - id: aspnetcore.components.type
+        type: string
+        stability: development
+        brief: Full type name of the Blazor component.
+        note: >
+          This is full name of the C# component class, including the namespace.
+          More about [Blazor event handling](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/event-handling)
+        examples: ["Contoso.Weather"]
+      - id: aspnetcore.components.attribute.name
+        type: string
+        stability: development
+        brief: Attribute name of the event handler in Blazor component.
+        note: >
+          This is name of the binding attribute in the component markup.
+          More about [Blazor event handling](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/event-handling)
+        examples: ["onclick"]
+      - id: aspnetcore.components.route
+        type: string
+        stability: development
+        brief: Segment of the URL that is matched to a Blazor @page component.
+        note: >
+          This route pattern is used to match the URL to the component.
+          More about [Blazor routing](https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/routing)
+        examples: ["/weather", "/counter"]
+      - id: aspnetcore.components.circuit.id
+        type: string
+        stability: development
+        brief: Id of the Blazor circuit.
+        note: More about [Blazor circuits](https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/signalr)
+        examples: ["ztOXUZxeJvS2b3ioeZ68bal8RQmQehui02CtZER"]
diff --git a/model/aspnetcore/spans.yaml b/model/aspnetcore/spans.yaml
new file mode 100644
index 0000000000..6e1c5af995
--- /dev/null
+++ b/model/aspnetcore/spans.yaml
@@ -0,0 +1,55 @@
+groups:
+  - id: span.Microsoft.AspNetCore.Components.Server.Circuits.StartCircuit
+    type: span
+    span_kind: internal
+    brief: 
+    note: >
+      ActivitySource name: `Microsoft.AspNetCore.Components.Server.Circuits`; Added in: ASP.NET Core 10.0
+      More about [Blazor circuits](https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/signalr)
+    stability: development
+    attributes:
+      - ref: aspnetcore.components.circuit.id
+        requirement_level: required
+      - ref: error.type
+        requirement_level:
+          conditionally_required: if the circuit initialization failed
+  - id: span.Microsoft.AspNetCore.Components.Navigate
+    type: span
+    span_kind: internal
+    brief: 
+    note: >
+      ActivitySource name: `Microsoft.AspNetCore.Components`; Added in: ASP.NET Core 10.0
+      More about [Blazor routing](https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/routing)
+    stability: development
+    attributes:
+      - ref: aspnetcore.components.circuit.id
+        requirement_level: required
+      - ref: aspnetcore.components.type
+        requirement_level: required
+      - ref: aspnetcore.components.route
+        requirement_level: required
+      - ref: error.type
+        requirement_level:
+          conditionally_required: if the circuit initialization failed
+  - id: span.Microsoft.AspNetCore.Components.HandleEvent
+    type: span
+    span_kind: internal
+    brief: 
+    note: >
+      ActivitySource name: `Microsoft.AspNetCore.Components`; Added in: ASP.NET Core 10.0
+      More about [Blazor event handling](https://learn.microsoft.com/en-us/aspnet/core/blazor/components/event-handling)
+    stability: development
+    attributes:
+      - ref: aspnetcore.components.circuit.id
+        requirement_level: required
+      - ref: aspnetcore.components.type
+        requirement_level: required
+      - ref: aspnetcore.components.route
+        requirement_level: required
+      - ref: code.function.name
+        requirement_level: required
+      - ref: aspnetcore.components.attribute.name
+        requirement_level: required
+      - ref: error.type
+        requirement_level:
+          conditionally_required: if the circuit initialization failed