General Availability: VPC Flow Logs adds the following metadata annotations

## Feature Feature **General Availability**: VPC Flow Logs adds the following metadata annotations and packet drop reasons for Cloud NAT: * Metadata annotations: `connection.nat_ip`, `connection.nat_port`, and`nat_gateway_details` * Drop reasons: `NAT_ENDPOINT_INDEPENDENT_CONFLICT`, `NAT_OUT_OF_CONNECTIONS`, and `NAT_OUT_OF_PORTS` For more information, see[Record format](https://cloud.google.com/vpc/docs/about-flow-logs-records#record%5Fformat) and[Packet drop reasons](https://cloud.google.com/vpc/docs/about-flow-logs-records#drop-reason).