fix otel middleware instrumentation (#13219)

* fix otel instrumentation

* fix name conflict

src/backend/InvenTree/InvenTree/settings.py

@@ -34,6 +34,7 @@ from InvenTree.config import (
 )
 from InvenTree.ready import isInMainThread, isRunningBackup
 from InvenTree.sentry import default_sentry_dsn, init_sentry
+from InvenTree.tracing import ensure_otel_middleware
 from InvenTree.validators import invalid_site_url_hint
 from InvenTree.version import checkMinPythonVersion, inventreeCommitHash
 from users.oauth2_scopes import oauth2_scopes
@@ -702,6 +703,7 @@ TRACING_ENABLED = (
 TRACING_DETAILS: Optional[dict] = tracing.configure_tracing(
     DB_ENGINE, TRACING_ENABLED, inventree_tags
 )
+MIDDLEWARE = ensure_otel_middleware(MIDDLEWARE)
 
 # Cache configuration
 GLOBAL_CACHE_ENABLED = is_global_cache_enabled()

src/backend/InvenTree/InvenTree/tracing.py

@@ -173,6 +173,14 @@ def setup_tracing(
     TRACE_PID = os.getpid()
 
 
+def ensure_otel_middleware(middleware):
+    """Ensure the OTELmiddleware is the first entry in MIDDLEWARE."""
+    if not DjangoInstrumentor().is_instrumented_by_opentelemetry:
+        return list(middleware)
+    otel = DjangoInstrumentor._opentelemetry_middleware
+    return [otel, *(m for m in middleware if m != otel)]
+
+
 def setup_instruments(db_engine: str):  # pragma: no cover
     """Run auto-instrumentation for OpenTelemetry tracing."""
     if not DjangoInstrumentor()._is_instrumented_by_opentelemetry: