docs: def validate_check_configs(cls, config):
          """
          Config validation specific to the health check options.
  
          Verifies that checks are defined along with an interval, and calls
          out to the `Check` class to make sure each individual check's config
          is valid.
          """
          if "checks" not in config:
              raise ValueError("No checks defined.")
          if "interval" not in config["checks"]:
              raise ValueError("No check interval defined.")
  
          for check_name, check_config in six.iteritems(config["checks"]):
              if check_name == "interval":
                  continue
  
              Check.from_config(check_name, check_config)