code: def sentinel(request, cluster):
      return Sentinel([("foo", 26379), ("bar", 26379)])
  
imports: import socket
  from unittest import mock
  import pytest
  import redis.sentinel
  from redis import exceptions
  from redis.sentinel import MasterNotFoundError, Sentinel, SentinelConnectionPool, SlaveNotFoundError
label_desc: Use image node_id 3 for calling a global function with example usage: sentinel(request, cluster) and returns: Sentinel