Fix observability test CreateHttpClient endpoint resolution

Co-authored-by: devstress <30769729+devstress@users.noreply.github.com>

Author: Copilot

LocalTesting/LocalTesting.IntegrationTests/StepDefinitions/ObservabilityMetricsSteps.cs

@@ -48,8 +48,8 @@ private async Task EnsureInfrastructureInitialized()
         _app = await builder.BuildAsync();
         await _app.StartAsync();
 
-        // Create HTTP client with service discovery
-        _httpClient = _app.CreateHttpClient("localtesting-webapi");
+        // Create HTTP client with service discovery - use the correct endpoint name "webapi"
+        _httpClient = _app.CreateHttpClient("localtesting-webapi", "webapi");
         _httpClient.Timeout = TimeSpan.FromMinutes(15); // Extended timeout for 1M messages
 
         lock (_lockObject)

test-observability-fix.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Test script for observability tests fix - requires .NET 9.0 environment
+echo "🔧 Testing Observability Tests Fix"
+echo "📋 Fixed: CreateHttpClient endpoint name issue"
+echo ""
+
+# Check .NET version
+echo "1. Checking .NET version..."
+dotnet --version
+
+if [ $? -ne 0 ]; then
+    echo "❌ .NET 9.0 SDK not found. Please install .NET 9.0.100 or later."
+    echo "📥 Download from: https://dotnet.microsoft.com/download/dotnet/9.0"
+    exit 1
+fi
+
+echo ""
+echo "2. Building LocalTesting solution..."
+dotnet build LocalTesting/LocalTesting.sln --configuration Release
+
+if [ $? -ne 0 ]; then
+    echo "❌ Build failed. Cannot proceed with observability tests."
+    exit 1
+fi
+
+echo ""
+echo "3. Running observability tests..."
+dotnet test LocalTesting/LocalTesting.IntegrationTests --filter "Category=observability" --configuration Release
+
+echo ""
+echo "✅ Observability test execution completed"
+echo "🔧 Fix applied: Corrected CreateHttpClient endpoint name from 'localtesting-webapi' to ('localtesting-webapi', 'webapi')"
+echo "📝 The Aspire testing framework now properly resolves the HTTP endpoint"