Problem

Currently the host metadata is send on specific occasions like the request to refresh active checks on an active agent or after restarting an agent.
But this might occur not often enough to send metadata before a agent is stopped manually.

For example:
Currently we use the metadata field for actions on autoregister. We have a local script to trigger some maintenance things which also adds an host metadata "maintenance", then restarts the zabbix agent to submit the host metadata and then stops the agent service. An action catches this metadata and moves the host to a specific host group.

If the metadata is sent right before the agent service is terminated it could be used to widen the automation options on actions.