add note about logic

Author: Sherif Akoush

scheduler/pkg/scheduler/scheduler.go

@@ -169,6 +169,12 @@ func (s *SimpleScheduler) scheduleToServer(modelName string) error {
 		WithField("desired_replicas", desiredReplicas).
 		Debug("Identified candidate servers for model")
 
+	// The main logic of trying to find a server for the model is as follows:
+	// 1. If there are enough replicas on a server, schedule the model
+	// 2. If there are not enough replicas on a server, try to schedule with min replicas. In this case we actually should get 
+	// the models loaded on all the replicas of the servers (assuming min replicas is less than the number of replicas on the server)
+	// we also mark the model in this case as failed to schedule so that if the infra changes in the future we can try to reschedule
+
 	// For each server filter and sort replicas and attempt schedule if enough replicas
 	ok := s.findAndUpdateToServers(filteredServers, latestModel, desiredReplicas, desiredReplicas)
 	// Try to scheduler with min replicas if not enough replicas