code: def get(self):
      self.write(
          "# Prometheus metrics are not available, see: "
          "https://docs.dask.org/en/stable/how-to/setup-prometheus.html#setup-prometheus-monitoring"
      )
      self.set_header("Content-Type", "text/plain; version=0.0.4")
  
file_path: distributed/distributed/http/prometheus.py
imports: from __future__ import annotations
  from importlib import import_module
  import dask.config
  from distributed.http.utils import RequestHandler
label_desc: Use image node_id 1 for calling the PrometheusNotAvailableHandler obj's underlying member method code with example usage: obj.get() without return types