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For the zombie problem, Consul has always deregistered dead nodes (and their associated services) automatically after 72 hours. Consul 0.7 added the ability to define a health check attribute called "deregister_critical_service_after" which will deregister a service automatically if a check is failed for longer than this value. This helps clean up services from processes that register themselves that might not get shut down cleanly for whatever reason.

Details are here - https://www.consul.io/docs/agent/checks.html.