For etcd: <a href="https:&#x2F;&#x2F;coreos.com&#x2F;etcd&#x2F;docs&#x2F;0.4.7&#x2F;etcd-api&#x2F;" rel="nofollow">https:&#x2F;&#x2F;coreos.com&#x2F;etcd&#x2F;docs&#x2F;0.4.7&#x2F;etcd-api&#x2F;</a><p>node.modifiedIndex appears sensible for fencing.