CI Failure ('events_total' not in samples) in `DataTransformsLoggingMetricsTest.test_logger_metrics_values`

[vbotbuildovich]

https://buildkite.com/redpanda/redpanda/builds/48077

Module: rptest.tests.data_transforms_test
Class: DataTransformsLoggingMetricsTest
Method: test_logger_metrics_values

test_id:    DataTransformsLoggingMetricsTest.test_logger_metrics_values
status:     FAIL
run time:   69.225 seconds

KeyError('events_total')
Traceback (most recent call last):
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/tests/runner_client.py", line 184, in _do_run
    data = self.run_test()
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/tests/runner_client.py", line 276, in run_test
    return self.test_context.function(self.test)
  File "/root/tests/rptest/services/cluster.py", line 103, in wrapped
    r = f(self, *args, **kwargs)
  File "/root/tests/rptest/tests/data_transforms_test.py", line 890, in test_logger_metrics_values
    wait_until(lambda: get_total_events()[0] >= n_events_expected,
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/utils/util.py", line 53, in wait_until
    raise e
  File "/opt/.ducktape-venv/lib/python3.10/site-packages/ducktape/utils/util.py", line 44, in wait_until
    if condition():
  File "/root/tests/rptest/tests/data_transforms_test.py", line 890, in <lambda>
    wait_until(lambda: get_total_events()[0] >= n_events_expected,
  File "/root/tests/rptest/tests/data_transforms_test.py", line 883, in get_total_events
    totals, dropped = get_total_events_per_xform()
  File "/root/tests/rptest/tests/data_transforms_test.py", line 873, in get_total_events_per_xform
    for m in samples['events_total']:
KeyError: 'events_total'

JIRA Link: CORE-2482