class_docstr: Health check in the head.
  
  This module adds health check related endpoint to the head to check
  GCS's heath.
code: def __init__(self, dashboard_head):
      super().__init__(dashboard_head)
      self._health_checker = HealthChecker(
          dashboard_head.gcs_aio_client
      )
  
file_path: ray/python/ray/dashboard/modules/healthz/healthz_head.py
imports: import ray.dashboard.utils
  import ray.dashboard.optional_utils
  from ray.dashboard.modules.healthz.utils import HealthChecker
  from aiohttp.web import Request, Response, HTTPServiceUnavailable
label_desc: Use image node_id 1 to create a new HealthzHead object from inherited base classes: dashboard_utils with example: obj = HealthzHead(dashboard_head)