Downside is that Loki can't handle high-cardinality labels, such as a `Request-Id`, IP-addresses or user-ids.

I'd be happy to move from ELK to Loki, but no option to filter on IP-address or User-IDs is a big drawback.

It's an open issue though, so may be added in the future: https://github.com/grafana/loki/issues/91