Fix undefined name: StateSamplerInfo on line 58

sdks/python/apache_beam/runners/worker/statesampler.py

@@ -20,6 +20,7 @@
 from collections import namedtuple
 
 from apache_beam.metrics import execution
+from apache_beam.runners.worker.statesamplerinfo import StateSamplerInfo
 from apache_beam.utils.counters import Counter
 from apache_beam.utils.counters import CounterName
 

sdks/python/apache_beam/runners/worker/statesampler_slow.py

@@ -17,6 +17,8 @@
 
 # This module is experimental. No backwards-compatibility guarantees.
 
+from apache_beam.runners.worker.statesamplerinfo import StateSamplerInfo
+
 
 class StateSampler(object):
 

sdks/python/apache_beam/runners/worker/statesamplerinfo.py

@@ -0,0 +1,23 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# This module is experimental. No backwards-compatibility guarantees.
+from collections import namedtuple
+
+StateSamplerInfo = namedtuple(
+    'StateSamplerInfo',
+    ['state_name', 'transition_count', 'time_since_transition'])