Some Interfaces are marked as not polled in CAPM even though they're up and running on the device with ifAdminStatus UP.
Update Metric Family and rediscovery makes no difference.
DX NetOps CAPM all currently supported releases
The interface is wrongly configured on the device.
The Port interface is wrongly configured as a WAN interface on the Router/Switch.
Configured correctly, in this case, as a Tunnel interface, will allow CAPM to poll it.