Looks like there is maybe some kind of trouble with the CNS Switch.
There are a lot of cacti graphing gaps displayed but only for the ports being queried on the CNS switch itself. Looks like it started around 2pm yesterday.

Looking at the LAG port graph off the main switch, it does not appear to be affecting actual member traffic so it may be a management issue with the CNS switch or some other control plane issue possibly. Could be indicative of a larger, brewing problem.