[ixpmanager] MRTG graphs broken for one customer

[Nick Hilliard]

Tom Duff wrote on 10/11/2018 14:39:
> I just pored through all the database tables trying to find any
> differences between the trouble customer and all the other customers.
> I came up with nothing.
> 
> So, I deleted the port completely from the bad customer record, and
> made a brand new customer record, and added the same old port to the
> new record. The graphs now generate. No idea why.

that's very peculiar.  I wonder was it something like an inconsistency 
in memcached.  If you see this again, can you try restarting memcached?

Nick