temp: check output of test

tests/rptest/transactions/tx_atomic_produce_consume_test.py

@@ -300,7 +300,7 @@ def validate_transform(self):
         dst_high_watermarks = self.get_high_watermarks(self._dst_topic)
         for p, hw in src_high_watermarks.items():
             assert dst_high_watermarks[
-                p] >= hw, "Transformed partitions must the same or larger watermark than source"
+                p] >= hw, f"Transformed partitions {p} must the same or larger watermark than source {hw}"
         src_msgs = defaultdict(list)
         dst_msgs = defaultdict(list)
         consumer = ck.DeserializingConsumer({