text: from prometheus_client import Summary
  from prometheus_client.exposition import generate_latest
  
  from flask_restful import Resource
  from flask import Response
  
  REQUEST_TIME = Summary('request_processing_seconds', 'Time spent processing request')
  
  class Metrics(Resource):
      """ Resource for exposing metrics to prometheus. """
  
      def get(self):
          """ get endpoint """
  
          latest = generate_latest()
          resp = Response(latest, headers={'Content-Type': 'text/plain'})
  
          return resp
  