Zhitao Li commented on MESOS-6177:

[~anandmazumdar], I'm strongly inclined to return the full {{AgentInfo}} 
instead of only {{AgentID}} for agents in {{recovered}} state.

My primary intention is to have a hold of {{pid}}, so the operator/subscriber 
can know the ip:port the agent is listening at. If we only return {{AgentID}}, 
the operator can do little additional babysitting steps to validate the state 
of the agent, except for waiting for {{--agent_reregistration_timeout}} to pass.

This is also pretty easy to implement IIUIC: we can simply change the 
{{slaves.recovered}} from {{hashset<SlaveID>}} to {{hashmap<SlaveID, 
SlaveInfo>}}. The {{SlaveInfo}} is already available after Registrar recovers 

> Return unregistered agents recovered from registrar in `GetAgents` and/or 
> `/state.json`
> ---------------------------------------------------------------------------------------
>                 Key: MESOS-6177
>                 URL: https://issues.apache.org/jira/browse/MESOS-6177
>             Project: Mesos
>          Issue Type: Improvement
>          Components: HTTP API
>            Reporter: Zhitao Li
>            Assignee: Zhitao Li
> Use case:
> This can be used for any software which talks to Mesos master to better 
> understand state of an unregistered agent after a master failover.
> If this information is available, the use case in MESOS-6174 can be handled 
> with a simpler decision of whether the corresponding agent is removed.

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