A pool represents a group of members over which the load balancing will be applied.
  Method:
  The load balancer algorithm that distributes traffic to the pool members.
  
    - 
      LEAST_CONNECTIONS: Allocates requests to the instance with the least number of active
      connections.
    
- 
      ROUND_ROBIN: Rotates requests evenly between multiple instances.
    
- 
      SOURCE_IP: Requests from a unique source IP address are consistently directed to the same instance.