I run a Bitcoin node for about 1.5 months and I notice that there is no feeler connection is made in 25 days, hence the IPs in the tried table does not grow.
I also notice in the debug.log during the same period of time, many potential stale tips are detected:
2019-02-20T13:26:59Z Potential stale tip detected, will try using extra outbound peer (last tip update: 2737 seconds ago)
Does extra outbound connection when tip is stale disable feeler connection? If yes, is it normal to have stale tip for 20+ days?