tests: marked flaky librdkafka tests ok to fail

Signed-off-by: Michal Maslanka <michal@redpanda.com>

tests/rptest/tests/librdkafka_test.py

@@ -11,7 +11,7 @@
 import os
 
 from rptest.services.cluster import cluster
-from ducktape.mark import matrix
+from ducktape.mark import matrix, ok_to_fail
 
 from rptest.services.librdkafka_test_case import LibrdkafkaTestcase
 from rptest.tests.redpanda_test import RedpandaTest
@@ -73,9 +73,10 @@ def __init__(self, context):
  "default_topic_partitions": 4
  })
 
+ @ok_to_fail #
  @cluster(num_nodes=4)
  @matrix(test_num=tests_to_run())
- @skip_debug_mode
+ @skip_debug_mode # https://github.com/redpanda-data/redpanda/issues/7148
  def test_librdkafka(self, test_num):
  tc = LibrdkafkaTestcase(self.test_context, self.redpanda, test_num)
  tc.start()