Upgrade to 7.1rc7: Some resource graph history is lost

I am using a RB5009 and upgraded from 7.1rc6 to 7.1rc7 which went smooth.
I’ve enabled resource graphing for lots of ports. But the history of some items was lost.

History kept:

  • CPU
  • Memory
  • Disk
  • Bridge

History lost:

  • Ether1 - Ether8
  • PPPoE
  • SFP+