From 014fc042a0c3684023a372f21c23b92a20a42d54 Mon Sep 17 00:00:00 2001
From: Beau Findlay <beau.d.findlay@gmail.com>
Date: Sun, 1 Feb 2026 11:56:24 +0000
Subject: [PATCH] Adds open telemetry for prometheus

---
 src/BlazorApp/BlazorApp.csproj |  6 ++++++
 src/BlazorApp/Program.cs       | 11 +++++++++++
 2 files changed, 17 insertions(+)

diff --git a/src/BlazorApp/BlazorApp.csproj b/src/BlazorApp/BlazorApp.csproj
index d179d3b..5670440 100644
--- a/src/BlazorApp/BlazorApp.csproj
+++ b/src/BlazorApp/BlazorApp.csproj
@@ -18,4 +18,10 @@
         </Content>
     </ItemGroup>
 
+    <ItemGroup>
+      <PackageReference Include="OpenTelemetry.Exporter.Prometheus.AspNetCore" Version="1.15.0-beta.1" />
+      <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.15.0" />
+      <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.15.0" />
+    </ItemGroup>
+
 </Project>
diff --git a/src/BlazorApp/Program.cs b/src/BlazorApp/Program.cs
index 45d3f56..0bfea61 100644
--- a/src/BlazorApp/Program.cs
+++ b/src/BlazorApp/Program.cs
@@ -1,9 +1,18 @@
 using BlazorApp.Components;
+using OpenTelemetry.Metrics;
 
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddRazorComponents();
 
+builder.Services.AddOpenTelemetry()
+	.WithMetrics(metrics =>
+	{
+		metrics.AddAspNetCoreInstrumentation();
+		metrics.AddPrometheusExporter();
+	});
+
+
 var app = builder.Build();
 
 app.MapGet("/health", () => Results.Ok(new
@@ -12,6 +21,8 @@ app.MapGet("/health", () => Results.Ok(new
 	timestamp = DateTime.UtcNow
 }));
 
+app.MapPrometheusScrapingEndpoint();
+
 if (!app.Environment.IsDevelopment())
 {
 	app.UseExceptionHandler("/Error", true);