This is a follow up from T311218: Netbox: use FHRP Groups feature
The sub-task allowed us to have a cleaner IPAM by getting rid of duplicate VRRP records (from one per device to a single VRRP group).

It also allows us to manage VRRP priorities (currently set to 0 in Netbox).

eqiad/codfw routers uses VRRP pinning to artificially balance traffic through the two main eqiad<->codfw transports.
Other sites use the default value of 100.

Driving the VRRP priority from Netbox would help us improve our automation, specifically when we need to drain a router for maintenance (eg. set a lower priority on the node to "depool").

2 reasons to set this task as a low priority:

• Moving the values to Netbox (when applicable) is easy, but the tooling to change the values on all the interfaces would requires either a custom script or a cookbook and could be more significant work. For a task that we don't perform often. This could however be combined with other similar tasks such as T260355: Transport circuits draining automation.
• The new DC design is moving away from VRRP, so this work would become deprecated in the next few years