diff --git a/sdks/python/apache_beam/runners/worker/statesampler_fast.pxd b/sdks/python/apache_beam/runners/worker/statesampler_fast.pxd
index 2da588effd25..aebf9f69dd86 100644
--- a/sdks/python/apache_beam/runners/worker/statesampler_fast.pxd
+++ b/sdks/python/apache_beam/runners/worker/statesampler_fast.pxd
@@ -18,12 +18,11 @@
 cimport cython
 
 from apache_beam.metrics.execution cimport MetricsContainer
-from apache_beam.runners.worker.statesampler_interface cimport StateSamplerInterface
 
 from cpython cimport pythread
 from libc.stdint cimport int32_t, int64_t
 
-cdef class StateSampler(StateSamplerInterface):
+cdef class StateSampler(object):
   """Tracks time spent in states during pipeline execution."""
   cdef int _sampling_period_ms
   cdef int _sampling_period_ms_start
diff --git a/sdks/python/apache_beam/runners/worker/statesampler_fast.pyx b/sdks/python/apache_beam/runners/worker/statesampler_fast.pyx
index 7345ec618121..45700a0b0f81 100644
--- a/sdks/python/apache_beam/runners/worker/statesampler_fast.pyx
+++ b/sdks/python/apache_beam/runners/worker/statesampler_fast.pyx
@@ -36,7 +36,6 @@ import threading
 
 from apache_beam.utils.counters import CounterName
 from apache_beam.metrics.execution cimport MetricsContainer
-from apache_beam.runners.worker.statesampler_interface cimport StateSamplerInterface
 
 cimport cython
 from cpython cimport pythread
@@ -68,7 +67,7 @@ cdef inline int64_t get_nsec_time() noexcept nogil:
       current_time.tv_nsec)
 
 
-cdef class StateSampler(StateSamplerInterface):
+cdef class StateSampler(object):
   """Tracks time spent in states during pipeline execution."""
 
   def __init__(self,
diff --git a/sdks/python/apache_beam/runners/worker/statesampler_stub.py b/sdks/python/apache_beam/runners/worker/statesampler_stub.py
index 60cdd0155c0a..563eaed8be43 100644
--- a/sdks/python/apache_beam/runners/worker/statesampler_stub.py
+++ b/sdks/python/apache_beam/runners/worker/statesampler_stub.py
@@ -20,10 +20,13 @@
 
 class StubStateSampler(StateSamplerInterface):
   def __init__(self):
-    self._update_metric_calls = []
+    self._update_metric_calls = {}
 
   def update_metric(self, typed_metric_name, value):
-    self._update_metric_calls.append((typed_metric_name, value))
+    if (typed_metric_name not in self._update_metric_calls):
+      self._update_metric_calls[typed_metric_name] = value
+      return
+    self._update_metric_calls[typed_metric_name] += value
 
   def get_recorded_calls(self):
     return self._update_metric_calls
diff --git a/sdks/python/apache_beam/transforms/core.py b/sdks/python/apache_beam/transforms/core.py
index 0b0d2f823bc3..f75d70edee71 100644
--- a/sdks/python/apache_beam/transforms/core.py
+++ b/sdks/python/apache_beam/transforms/core.py
@@ -2589,7 +2589,7 @@ def __init__(self, pool_submitter_fn, process_fn, timeout):
     """
     Args:
       pool_submitter_fn (Callable): The process or thread pool submit function.
-        process_fn (Callable): DoFn#process function to be executed in a 
+        process_fn (Callable): DoFn#process function to be executed in a
         subprocess or thread.
       timeout (Optional[float]): The maximum time allowed for execution.
     """
@@ -2634,7 +2634,9 @@ def submit(self, *args, **kwargs):
     tracker = get_current_tracker()
 
     if tracker is not None:
-      for typed_metric_name, value in stub_state_sampler.get_recorded_calls():
+      for typed_metric_name, value in (
+        stub_state_sampler.get_recorded_calls().items()
+      ):
         tracker.update_metric(typed_metric_name, value)
     if results is None:
       return
diff --git a/sdks/python/apache_beam/transforms/ptransform_test.py b/sdks/python/apache_beam/transforms/ptransform_test.py
index 4d54596b6fda..253735be2baa 100644
--- a/sdks/python/apache_beam/transforms/ptransform_test.py
+++ b/sdks/python/apache_beam/transforms/ptransform_test.py
@@ -2783,10 +2783,15 @@ def test_timeout(self):
   def test_increment_counter(self):
     class CounterDoFn(beam.DoFn):
       def __init__(self):
-        self.records_counter = Metrics.counter(self.__class__, 'recordsCounter')
+        self.records_counter1 = Metrics.counter(
+            self.__class__, 'recordsCounter1')
+        self.records_counter2 = Metrics.counter(
+            self.__class__, 'recordsCounter2')
 
       def process(self, element):
-        self.records_counter.inc()
+        self.records_counter1.inc()
+        self.records_counter2.inc()
+        self.records_counter2.inc()
         yield element
 
     with TestPipeline() as p:
@@ -2795,12 +2800,18 @@ def process(self, element):
           .with_exception_handling(
             use_subprocess=self.use_subprocess, timeout=1))
     results = p.result
-    metric_results = results.metrics().query(
-        MetricsFilter().with_name("recordsCounter"))
-    records_counter = metric_results['counters'][0]
 
-    self.assertEqual(records_counter.key.metric.name, 'recordsCounter')
-    self.assertEqual(records_counter.result, 3)
+    metric_results1 = results.metrics().query(
+        MetricsFilter().with_name("recordsCounter1"))
+    records_counter1 = metric_results1['counters'][0]
+    metric_results2 = results.metrics().query(
+        MetricsFilter().with_name("recordsCounter2"))
+    records_counter2 = metric_results2['counters'][0]
+
+    self.assertEqual(records_counter1.key.metric.name, 'recordsCounter1')
+    self.assertEqual(records_counter1.result, 3)
+    self.assertEqual(records_counter2.key.metric.name, 'recordsCounter2')
+    self.assertEqual(records_counter2.result, 6)
 
   def test_lifecycle(self):
     die = type(self).die