code: def unsubscribe_namespace_all_topics(
      self, tenant: str, namespace: str, subscription_name: str
  ):
      session = self._create_session()
      response = session.post(
          self.service_url
          + "namespaces/{}/{}/unsubscribe/{}".format(
              tenant, namespace, subscription_name
          )
      )
      return response
  
imports: import json
  import logging
  import requests
  from requests.adapters import HTTPAdapter
  from urllib3.util.retry import Retry
label_desc: Use image node_id 19 for calling the PulsarManager obj's underlying member method code with example usage: obj.unsubscribe_namespace_all_topics(tenant, namespace, subscription_name) and returns: response