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Sometimes, an instance could be in a powered-on state, but the failure of the operating system or any fatal error in internal operations of the instance could have rendered the instance inaccessible to users. In order to enable you to promptly detect such 'hidden' anomalies, this test periodically runs a connectivity check on each instance available for the configured AWS user account, and reports whether the instances are accessible over the network or not.

Measurement	Description	Measurement Unit	Interpretation
Avg_delay	Indicates the average delay between transmission of packet to this instance and receipt of the response to the packet at the source.	Secs	An increase in network latency could result from misconfiguration of the router(s) along the path, network congestion, retransmissions at the network, etc.
Min_delay	The minimum time between transmission of a packet and receipt of the response back.	Secs	A significant increase in the minimum round-trip time is often a sure sign of network congestion.
Pkt_loss_pct	Indicates the percentage of packets lost during transmission from source to target and back.	Percent	Packet loss is often caused by network buffer overflows at a network router or by packet corruptions over the network. The detailed diagnosis for this measure provides a listing of routers that are on the path from the external agent to target server, and the delays on each hop. This information can be used to diagnose the hop(s) that could be causing excessive packet loss/delays.
Availability	Indicates whether the network connection to this instance is available or not.	Percent	A value of 100 indicates that the instance is accessible over the network. The value 0 indicates that the instance is inaccessible. Typically, the value 100 corresponds to a Pkt_loss_pct of 0.