def get_checks(self, checks):
        """Add health checks to the `checks` dict

        checks: Dictionary, updated in-place:
          key: service name
          value: a future that resolves to either:
            - a bool (success/fail)
            - a dict with the field `"ok": bool` plus other information
        """
        if self.settings["use_registry"]:
            checks["Docker registry"] = self.check_docker_registry()
        checks["JupyterHub API"] = self.check_jupyterhub_api(self.hub_url)
Add health checks to the `checks` dict

        checks: Dictionary, updated in-place:
          key: service name
          value: a future that resolves to either:
            - a bool (success/fail)
            - a dict with the field `"ok": bool` plus other information
        
binderhub/health.py