Add OpenTelemetry instrumentation with middleware-only approach

scripts/test-opentelemetry.sh

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+#!/bin/bash
+
+# DanceLessonsCoach OpenTelemetry Test Script
+# This script tests OpenTelemetry integration with Jaeger
+
+set -e
+
+echo -e "\033[1;34m=== DanceLessonsCoach OpenTelemetry Test ===\033[0m"
+echo ""
+
+# Configuration
+PROJECT_DIR="/Users/gabrielradureau/Work/Vibe/DanceLessonsCoach"
+SERVER_CMD="./scripts/start-server.sh"
+LOG_FILE="server.log"
+PID_FILE="server.pid"
+
+cd "$PROJECT_DIR"
+
+# Clean up any existing server
+echo "Cleaning up any existing server..."
+if [ -f "$PID_FILE" ]; then
+    echo "Found existing PID file, stopping previous server..."
+    $SERVER_CMD stop > /dev/null 2>&1 || true
+    rm -f "$PID_FILE" "$LOG_FILE"
+fi
+
+# Kill any processes on port 8080
+pkill -9 -f "go run" > /dev/null 2>&1 || true
+lsof -ti :8080 | xargs -I {} kill -9 {} > /dev/null 2>&1 || true
+lsof -ti :4317 | xargs -I {} kill -9 {} > /dev/null 2>&1 || true
+sleep 1
+
+echo "Starting Jaeger in Docker..."
+# Start Jaeger container if not running
+if ! docker ps | grep -q "jaegertracing/all-in-one"; then
+    docker run -d --name jaeger \
+        -e COLLECTOR_OTLP_ENABLED=true \
+        -p 16686:16686 \
+        -p 4317:4317 \
+        -p 4318:4318 \
+        jaegertracing/all-in-one:latest
+    echo "Jaeger container started"
+    sleep 5
+else
+    echo "Jaeger container already running"
+fi
+
+echo "Starting server with OpenTelemetry enabled..."
+DLC_TELEMETRY_ENABLED=true DLC_TELEMETRY_OTLP_ENDPOINT="localhost:4317" DLC_TELEMETRY_INSECURE=true \
+    DLC_TELEMETRY_SERVICE_NAME="DanceLessonsCoach" $SERVER_CMD start
+sleep 3
+
+echo "Testing API endpoints..."
+
+# Test health endpoint
+echo "Testing /api/health:"
+HEALTH_RESPONSE=$(curl -s http://localhost:8080/api/health)
+echo "Response: $HEALTH_RESPONSE"
+
+# Test greet endpoint
+echo "Testing /api/v1/greet/:"
+GREET_RESPONSE=$(curl -s http://localhost:8080/api/v1/greet/)
+echo "Response: $GREET_RESPONSE"
+
+# Test greet with name
+echo "Testing /api/v1/greet/TestUser:"
+GREET_NAME_RESPONSE=$(curl -s http://localhost:8080/api/v1/greet/TestUser)
+echo "Response: $GREET_NAME_RESPONSE"
+
+echo ""
+echo "Stopping server..."
+$SERVER_CMD stop
+sleep 2
+
+echo ""
+echo -e "\033[0;32m✅ OpenTelemetry Test Complete!\033[0m"
+echo ""
+echo "To view traces in Jaeger:"
+echo "1. Open http://localhost:16686 in your browser"
+echo "2. Select 'DanceLessonsCoach' service"
+echo "3. Click 'Find Traces' button"
+echo ""
+echo "You should see traces for:"
+echo "- /api/health requests"
+echo "- /api/v1/greet/ requests"
+echo "- /api/v1/greet/TestUser requests"
+echo ""
+
+# Clean up
+rm -f "$PID_FILE" "$LOG_FILE"
+
+exit 0