Azure Virtual Network NAT metrics
Azure Virtual Network NAT gateway resources provide multi-dimensional metrics. You can use these metrics to observe the operation and for troubleshooting. Alerts can be configured for critical issues such as SNAT exhaustion.
Figure: Virtual Network NAT for outbound to Internet
NAT gateway resources provide the following multi-dimensional metrics in Azure Monitor:
|Bytes||Bytes processed inbound and outbound||Sum||Direction (In; Out), Protocol (6 TCP; 17 UDP)|
|Packets||Packets processed inbound and outbound||Sum||Direction (In; Out), Protocol (6 TCP; 17 UDP)|
|Dropped packets||Packets dropped by the NAT gateway||Sum||/|
|SNAT Connection Count||State transitions per interval||Sum||Connection State, Protocol (6 TCP; 17 UDP)|
|Total SNAT connection count||Current active SNAT connections (~ SNAT ports in use)||Sum||Protocol (6 TCP; 17 UDP)|
|Datapath availability (Preview)||Availability of the data path of the NAT gateway. Used to determine whether the NAT gateway endpoints are available for outbound traffic flow.||Avg||Availability (0, 100)|
Alerts for metrics can be configured in Azure Monitor for each of the preceding metrics.
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