// block forever on
func (con *ProxyConnection) sendDeltaRequest(req *discovery.DeltaDiscoveryRequest) {
	con.deltaRequestsChan.Put(req)
}

// DeltaAggregatedResources is an implementation of Delta XDS API used for proxying between Istiod and Envoy.
// Every time envoy makes a fresh connection to the agent, we reestablish a new connection to the upstream xds

				log.Errorf("failed to send: %v", err)
				return err
			}
		} else {
			log.Errorf("failed to call tap request: %v", err)
			return err
		}
	}
	return nil
}

func (p *tapProxy) DeltaAggregatedResources(downstream DeltaDiscoveryStream) error {
	return fmt.Errorf("not implemented")

		event.Healthy = req.ErrorDetail == nil
		if !event.Healthy {
			event.Message = req.ErrorDetail.Message
		}
		s.WorkloadEntryController.QueueWorkloadEntryHealth(proxy, event)
	}
}

// DeltaAggregatedResources is not implemented.
// Instead, Generators may send only updates/add, with Delete indicated by an empty spec.
// This works if both ends follow this model. For example EDS and the API generator follow this
// pattern.