Added deprecation warning

Author: antonpirker

sentry_sdk/scope.py

@@ -167,6 +167,7 @@ def transaction(self, value):
         """When set this forces a specific transaction name to be set.
 
         Deprecated: use set_transaction_name instead."""
+
         # XXX: the docstring above is misleading. The implementation of
         # apply_to_event prefers an existing value of event.transaction over
         # anything set in the scope.
@@ -176,6 +177,10 @@ def transaction(self, value):
         # Without breaking version compatibility, we could make the setter set a
         # transaction name or transaction (self._span) depending on the type of
         # the value argument.
+
+        logger.warning(
+            "Assigning to scope.transaction directly is deprecated: use scope.set_transaction_name() instead."
+        )
         self._transaction = value
         if self._span and self._span.containing_transaction:
             self._span.containing_transaction.name = value