Following is the response from our team:
It returns queue statistics and count of agents in every possible state for that queue. An agent may be a member of one or more Queues.
See the section Precision Queue Routing http://docs.expertflow.com/x/KgCpBQ for details. A summary is:
Agents are assigned a set of Attributes, where an Attribute is a boolean or proficiency rating (1-10).
A Precision Queue is created with a set of steps with each step evaluating expressions based on Attributes.
An Agent A may therefore qualify to be a member of all queues where queue expression passes.
When we run Queue stats via api /api/AgentStats, we may see the same agent A statistics from all the queues the agent A qualified for.
Please confirm if it answers your query