Which option is not included in the OCI load balancer backend sets?

The load balancer shape pertains to the overall capacity and performance tier of the load balancer itself, which dictates how much traffic it can handle and what features may be available. While this is crucial for managing load balancing as a whole, the backend sets specifically focus on the configurations and settings directly related to the individual backend servers that are part of the load balancing process.

Backend servers are those instances that handle the actual workloads directed by the load balancer. Health check configurations are vital as they determine whether the backend servers are healthy and available to serve requests. Session persistence settings are also essential, as they ensure that a user’s requests are consistently routed to the same backend server, enhancing the user experience.

In summary, the load balancer shape defines the system's overall capabilities rather than the specific backend server configurations, making it the option that is not included in the OCI load balancer backend sets.