OSSEC HIDS list_agents: List available agents.
list_agents is only available on OSSEC servers or local mode installations. It can be used to retrieve
a list of all OSSEC agents that successfully connected to the server in the past
a list of all OSSEC agents currently connected to the server
a list of all OSSEC agents that were connected to the server in the past but are currently not connected.
If an agent was added via the manage_agents tool but has not yet been connected to the server, it will not show up in the output of list_agents.