Upgrade from 1.14.11 -> 1.15.10 results in "server has been offline for more than the configured server_rejoin_age_max" error

I’ve upgraded a Consul server from 1.14.4 → 1.14.11 without issue, but when I then attempt to upgrade to 1.15.10, I get the following error message on startup: refusing to rejoin cluster because server has been offline for more than the configured server_rejoin_age_max (168h0m0s) - consider wiping your data dir.

The server has been offline for only a fraction of a second during the systemctl restart consul command, so I’m not sure what the message is referring to here.

What could explain this error?

Thanks.

it looks like a bug… did you report an issue in GH?

No, I did not. I first wanted to make sure that it wasn’t just something stupid on my part. Since no one’s seems to have claimed that it is so far, I’ll open it as a bug. Thanks.