Gateway Group Offline Bug
In 2.5.0.a.20210121.2350 I discovered an issue that if you set a Gateway Group's Trigger Level to "Packet Loss or High Latency" the gateway is endlessly seen as down. "rule * disabled because gateway * is down". This does not occur if you set the trigger level to one of Member Down, Loss, or Latency.
How to check/reproduce:
Set the gateway to be used in a policy based rule using that gateway group. The generated rule will not have the forced next-router.
You can view this by going to System -> Advanced -> Misc -> "Do not create rules when gateway is down" then after creating the rule and rebuilding your rules, check /tmp/rules.debug. You will see a comment where the rule should be stating that the gateway is down.