feat: Presigned URL API 및 OpenTelemetry trace 추가

- Presigned URL API 추가 (MinIO/S3 private 버킷 지원)
- OpenTelemetry trace 설정 추가 (DEBUG=False 시 활성화)
- requirements.txt에 opentelemetry 패키지 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

blog_prj/wsgi.py

@@ -9,8 +9,76 @@ https://docs.djangoproject.com/en/4.2/howto/deployment/wsgi/
 
 import os
 
-from django.core.wsgi import get_wsgi_application
-
+# Django 설정을 미리 불러온다
 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'blog_prj.settings')
 
+from django.conf import settings
+from django.core.wsgi import get_wsgi_application
+
+# DEBUG 모드 아닐 때만 OpenTelemetry 활성
+if not settings.DEBUG:
+    import grpc
+    from opentelemetry import trace
+    from opentelemetry.sdk.resources import Resource
+    from opentelemetry.sdk.trace import TracerProvider
+    from opentelemetry.sdk.trace.export import BatchSpanProcessor
+    from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import OTLPSpanExporter
+    from opentelemetry.instrumentation.django import DjangoInstrumentor
+    from opentelemetry.instrumentation.requests import RequestsInstrumentor
+    from opentelemetry.instrumentation.logging import LoggingInstrumentor
+    from opentelemetry.instrumentation.dbapi import trace_integration
+    import MySQLdb
+
+    trace.set_tracer_provider(
+        TracerProvider(
+            resource=Resource.create({
+                "service.platform": settings.SERVICE_PLATFORM,
+                "service.name": settings.TRACE_SERVICE_NAME,
+            })
+        )
+    )
+
+    # TRACE_CA_CERT 설정에 따른 gRPC credentials 구성
+    credentials = None
+    ca_cert_path = os.getenv('TRACE_CA_CERT', '').strip()
+    if ca_cert_path and os.path.exists(ca_cert_path):
+        with open(ca_cert_path, 'rb') as f:
+            ca_cert = f.read()
+        credentials = grpc.ssl_channel_credentials(root_certificates=ca_cert)
+        insecure = False
+    else:
+        insecure = True
+
+    otlp_exporter = OTLPSpanExporter(
+        endpoint=settings.TRACE_ENDPOINT,
+        insecure=insecure,
+        credentials=credentials,
+        headers={
+            "x-scope-orgid": settings.SERVICE_PLATFORM,
+            "x-service": settings.TRACE_SERVICE_NAME
+        }
+    )
+
+    trace.get_tracer_provider().add_span_processor(
+        BatchSpanProcessor(otlp_exporter)
+    )
+
+    # Django 요청/응답 추적
+    DjangoInstrumentor().instrument()
+
+    # HTTP 클라이언트 요청 추적 (requests 라이브러리)
+    RequestsInstrumentor().instrument()
+
+    # 로그와 Trace 연동 (trace_id, span_id를 로그에 자동 추가)
+    LoggingInstrumentor().instrument(set_logging_format=True)
+
+    # MySQL DB 쿼리 추적
+    trace_integration(
+        MySQLdb,
+        "connect",
+        "mysql",
+        capture_parameters=True,
+    )
+
+
 application = get_wsgi_application()