opts := &buildClusterOpts{
				mutable: newClusterWrapper(&cluster.Cluster{
					ClusterDiscoveryType: &cluster.Cluster_Type{Type: test.discoveryType},
				}),
				mesh: push.Mesh,
			}
			cb.applyUpstreamTLSSettings(opts, test.tls, test.mtlsCtx)
			// apply proxy protocol settings
			cb.applyUpstreamProxyProtocol(opts, test.proxyProtocolSettings)
			cluster := opts.mutable.cluster