Replace DataDog/Terraform with open-source monitoring stack

.gitignore

@@ -72,12 +72,10 @@ Thumbs.db
 # mypy
 .mypy_cache/
 
-# Terraform
-terraform/.terraform/
-terraform/terraform.tfstate
-terraform/terraform.tfstate.backup
-terraform/terraform.tfvars
-terraform/tfplan
+# Monitoring volumes
+docker/monitoring/grafana/data/
+docker/monitoring/prometheus/data/
+docker/monitoring/loki/data/
 
 # Claude Code
 .claude/

backend.env.example

@@ -83,16 +83,11 @@ LOG_LEVEL=info
 CORS_ALLOWED_ORIGINS=http://localhost:5173,http://localhost:3000
 
 # ===========================================
-# DataDog 설정 (Optional)
-# ===========================================
-# DataDog 모니터링을 사용하려면 아래 주석을 해제하고 설정
-# DD_API_KEY=your-datadog-api-key
-# DD_SITE=ap1.datadoghq.com
-# DD_AGENT_HOST=datadog-agent
-# DD_TRACE_AGENT_PORT=8126
-# DD_ENV=dev
-# DD_SERVICE=speedcam
-# DD_LOGS_INJECTION=true
-# DD_TRACE_SAMPLE_RATE=1
-# DD_PROFILING_ENABLED=true
-# _DD_TRACE_WRITER_NATIVE=false  # gunicorn prefork 호환 (ddtrace v4+)
+# OpenTelemetry 설정
+# ===========================================
+OTEL_EXPORTER_OTLP_ENDPOINT=http://otel-collector:4317
+OTEL_EXPORTER_OTLP_PROTOCOL=grpc
+OTEL_RESOURCE_ATTRIBUTES=service.namespace=speedcam,deployment.environment=dev
+# Valid values: always_on, always_off, traceidratio, parentbased_always_on, parentbased_always_off, parentbased_traceidratio
+OTEL_TRACES_SAMPLER=parentbased_always_on
+OTEL_PYTHON_LOG_CORRELATION=true

config/settings/base.py

@@ -29,13 +29,15 @@
     "django_filters",
     "drf_yasg",
     "django_celery_results",
+    "django_prometheus",
     # Apps
     "apps.vehicles",
     "apps.detections",
     "apps.notifications",
 ]
 
 MIDDLEWARE = [
+    "django_prometheus.middleware.PrometheusBeforeMiddleware",
     "corsheaders.middleware.CorsMiddleware",
     "django.middleware.security.SecurityMiddleware",
     "django.contrib.sessions.middleware.SessionMiddleware",
@@ -44,6 +46,7 @@
     "django.contrib.auth.middleware.AuthenticationMiddleware",
     "django.contrib.messages.middleware.MessageMiddleware",
     "django.middleware.clickjacking.XFrameOptionsMiddleware",
+    "django_prometheus.middleware.PrometheusAfterMiddleware",
 ]
 
 ROOT_URLCONF = "config.urls"
@@ -155,8 +158,9 @@
     "disable_existing_loggers": False,
     "formatters": {
         "verbose": {
-            "format": "{levelname} {asctime} {module} {message}",
+            "format": "{levelname} {asctime} {module} [trace_id={otelTraceID} span_id={otelSpanID}] {message}",
             "style": "{",
+            "defaults": {"otelTraceID": "0", "otelSpanID": "0"},
         },
     },
     "handlers": {

config/urls.py

@@ -92,6 +92,8 @@ def health(request):
     re_path(
         r"^redoc/$", schema_view.with_ui("redoc", cache_timeout=0), name="schema-redoc"
     ),
+    # Prometheus Metrics
+    path("", include("django_prometheus.urls")),
     # API v1
     path("api/v1/", include("apps.vehicles.urls")),
     path("api/v1/", include("apps.detections.urls")),