Resolve "Add monitoring of traces based on OpenTelemetry"

Closes #57 (closed)

app/api/endpoints/workflow_execution.py

@@ -220,7 +220,7 @@ async def start_arbitrary_workflow(
     if not settings.DEV_SYSTEM:  # pragma: no cover
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Not available")
     current_span = trace.get_current_span()
-    current_span.set_attribute("repository_url", workflow_execution_in.repository_url)
+    current_span.set_attribute("repository_url", str(workflow_execution_in.repository_url))
     if workflow_execution_in.token is not None:
         current_span.set_attribute("private_repository", True)
     if workflow_execution_in.mode is not None: