code: def remove_retention(self, tenant: str, namespace: str):
      session = self._create_session()
      response = session.delete(
          self.service_url
          + "namespaces/{}/{}/retention".format(tenant, namespace),
      )
  
      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 21 for calling the PulsarManager obj's underlying member method code with example usage: obj.remove_retention(tenant, namespace) and returns: response