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 desc <tablename>.
Below are some common entities that you can use within the alerting system. This list is not exhaustive and you should look at the MySQL database schema for the full list.
Devices
Entity
Description
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
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.
Device Stats
Entity
Description
device_stats.ping_loss_last
Packet loss at last poll (percent)
device_stats.ping_loss_avg
Average packet loss (percent)
device_stats.ping_rtt_last
Ping RTT at last poll (ms)
device_stats.ping_rtt_avg
Average ping RTT (ms)
device_stats.ping_rtt_diff_avg_last
Difference between the RTT last and average ping (ms)
device_stats.ping_rtt_diff_avg_last
Difference between the RTT of the ping from the last 2 polls (ms)
Details on how the averages above are calculated can be found here.
The difference fields can be used to detect when ping times increase from their normal valuse.
BGP Peers
Entity
Description
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
Entity
Description
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.
Memory pools
Entity
Description
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
Entity
Description
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)