This sample deploys a Lambda function that monitors IPv4 utilization for Amazon VPC Subnets and published the metrics to CloudWatch as custom metrics.
The following metrics are published.
IPUsage/AvailableIPs
Gives a count of the total number of IPv4 addresses available in the subnet.
IPUsage/TotalIPs
Gives a count of the total possible IPv4 addresses in the subnet CIDR (based on the prefix, not usable IPs).
IPUsage/UsedIPs
Gives the count of IPv4 addresses current used including reserved IP addresses and IP addresses used by ENIs.
IPUsage/Utilization
Shows the percentage (as a float, not decimal representation of the percentage) of IPv4 space unusable in the subnet.
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