@viq short version: if you don't configure your log exporter correctly and you add the URL or referrer to the labels the cardinality of the metrics explode. Is not that it won't handle it, but your instance would have to be properly sized for this, and you might want to duplicate the metrics for querying them when you don't care about those labels.

Also, prom can't reveal other info like geoip or visit duration like other tools do.