Please see the docs

You can keep them anywhere, but large lookups like the geoip db should be outside of the deployment area. Instead manage deployment via some other management system (ansible, for example).

Ok, but how does the GeoIP function know where to look? The sample I grabbed from the " cribl-vpc-flow-for-security-teams" pack just has the filename in the "GeoIP file(.mmdb)" field, with no file path. Whats the default path for that?

By default, Stream will look for bare file names in $CRIBL_HOME/data/lookups