r External Services</a></li><li role=none><a role=treeitem title="Deploy environments that require isolation into separate meshes and enable inter-mesh communication by mesh federation (October 2, 2019)" href=/v1.9/blog/2019/isolated-clusters/>Multi-Mesh Deployments for Isolation and Boundary Protection</a></li><li role=none><a role=treeitem title="How can you use Istio to monitor blocked and passthrough external traffic (September 28, 2019)" href=/v1.9/blog/2019/monitoring-external-service-traffic/>Monitor