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Cloned from launchpad blueprint https://blueprints.launchpad.net/nova/+spec/vm-auto-ha-when-host-broken. Description: Currently vm ha is progressing with manually like evacuataion function. vm-auto-ha function is auto provisioining function. For this, we should satisfy several conditions. Nova exposes a vm-auto-ha API. The monitoring tool is required. For example, ceilometer monitors the compute node. When the ceilometer detects the compute node broken, it sends a vm-auto-ha api call ( including contents like broken_host and broken_time). Nova requests All the vm in broken host to auto-ha-hosts ( extra host for vm auto ha function). For administrator, admininstrator should register auto ha host. when administrator register, auto_ha_hosts db tables is updated. Specification URL (additional information): https://wiki.openstack.org/wiki/Autoha