How can I enable SNMP on latest Time Capsule 802.11ac?
Neither the AirPort Extreme 802.11ac nor the AirPort Time Capsule 802.11ac appear to support SNMP or syslog data to maintain or monitor these devices.

You'd have to load some custom firmware or discover an older management tool that can convince them to configure either of those services. Nothing I can find from Apple shows that either functionality remains on the current AirPort line of hardware.