class_docstr: Increments beam counters from values available at graph construction.
code: def expand(self, pcoll: beam.PCollection):
      def _incr(unused_value):
          for name, value in self._values.items():
              beam.metrics.Metrics.counter(
                  constants.METRICS_NAMESPACE, name
              ).inc(value)
          return None
  
      _ = (
          pcoll.pipeline
          | "CreateSingleton" >> beam.Create([1])
          | "IncrementCounters" >> beam.Map(_incr)
      )
  
imports: from typing import Mapping
  import apache_beam
  from tensorflow_data_validation import constants
label_desc: Use image node_id 2 for calling the IncrementJobCounters obj's underlying member method code with example usage: obj.expand(pcoll) and returns: None