Quality graphs are not generated for dynamic gateways until they are saved
If you have a dynamic WAN, it does not generate a quality graph until you edit the gateway and save. Presumably because there is no entry for a purely dynamic gateway in the config for the RRD code to use.
#2 Updated by Jim Pingle about 9 years ago
Many people will expect quality graphs to work "out of the box" with no extra work needed to set them up, especially in the default configuration of DHCP WAN.
I suppose when a gateway is renamed or deleted we could clean up the old RRD files to make sure the stale files don't pile up, but gateways probably won't change much.
I need to try to reproduce this again, however. I tried two days ago after a factory reset and it was making a quality graph like it should have. It may have been (inadvertently?) fixed since I originally noticed the behavior.