He @gregorip - This is because for geoip resolution, Sentry needs the Maxmind GeoIP database. Both due to some technical implementation needs and licensing restrictions we cannot ship this by default so you’ll need to add that (as a volume + config). You can track https://github.com/getsentry/onpremise/issues/310 for future updates on this.
There’s also some people who has done this and documented a bit on the forum: How to set GEOIP_PATH_MMDB?