Aspen Mesh)"><meta name=keywords content="microservices,services,mesh,monitoring,blackhole,passthrough"><meta property="og:title" content="Monitoring Blocked and Passthrough External Service Traffic"><meta property="og:type" content="website"><meta property="og:description" content="How can you use Istio to monitor blocked and passthrough external traffic."><meta property="og:url" content="/v1.21/blog/2019/monitoring-external-service-traffic/"><meta property="og:image" content="https://raw.githubusercontent