text: """Handlers for serving prometheus metrics"""
  from prometheus_client import CONTENT_TYPE_LATEST
  from prometheus_client import generate_latest
  from prometheus_client import REGISTRY
  
  from ..utils import metrics_authentication
  from .base import BaseHandler
  
  
  class MetricsHandler(BaseHandler):
      """
      Handler to serve Prometheus metrics
      """
  
      @metrics_authentication
      async def get(self):
          self.set_header('Content-Type', CONTENT_TYPE_LATEST)
          self.write(generate_latest(REGISTRY))
  
  
  default_handlers = [
      (r'/metrics$', MetricsHandler),
      (r'/api/metrics$', MetricsHandler),
  ]
  