Entities as described earlier are based on the table and column names within the database, if you are unsure of what the entity is you want then have a browse around inside MySQL using
show tables and
devices.hostname = The device hostname.
devices.sysName = The device sysName.
devices.sysDescr = The device sysDescr.
devices.hardware = The device hardware.
devices.version = The device os version.
devices.location = The device location.
devices.status = The status of the device, 1 = up, 0 = down.
devices.status_reason = The reason the device was detected as down (icmp or snmp).
devices.ignore = If the device is ignored this will be set to 1.
devices.disabled = If the device is disabled this will be set to 1.
devices.last_polled = The the last polled datetime (yyyy-mm-dd hh:mm:ss).
devices.type = The device type such as network, server, firewall, etc.
bgpPeers.astext = This is the description of the BGP Peer.
bgpPeers.bgpPeerIdentifier = The IP address of the BGP Peer.
bgpPeers.bgpPeerRemoteAs = The AS number of the BGP Peer.
bgpPeers.bgpPeerState = The operational state of the BGP session.
bgpPeers.bgpPeerAdminStatus = The administrative state of the BGP session.
bgpPeers.bgpLocalAddr = The local address of the BGP session.
ipsec_tunnels.peer_addr = The remote VPN peer address.
ipsec_tunnels.local_addr = The local VPN address.
ipsec_tunnels.tunnel_status = The VPN tunnels operational status.
mempools.mempool_type = The memory pool type such as hrstorage, cmp and cemp.
mempools.mempool_descr = The description of the pool such as Physical memory, Virtual memory and System memory.
mempools.mempool_perc = The used percentage of the memory pool.
ports.ifDescr = The interface description.
ports.ifName = The interface name.
ports.ifSpeed = The port speed in bps.
ports.ifHighSpeed = The port speed in mbps.
ports.ifOperStatus = The operational status of the port (up or down).
ports.ifAdminStatus = The administrative status of the port (up or down).
ports.ifDuplex = Duplex setting of the port.
ports.ifMtu = The MTU setting of the port.
processors.processor_usage = The usage of the processor as a percentage.
processors.processor_descr = The description of the processor.
storage.storage_descr = The description of the storage.
storage.storage_perc = The usage of the storage as a percentage.
sensors.sensor_desc = The sensors description.
sensors.sensor_current = The current sensors value.
sensors.sensor_prev = The previous sensor value.
sensors.lastupdate = The sensors last updated datetime stamp.