Snowplow is also an option. It’s an open-source data collection solution that, unlike GA, gives you full ownership of your event-level data and the freedom to define your own data structures. Not exactly what you’d call ‘lightweight’ but quite a few Snowplow users/customers have come from GA for the level of flexibility and control they can have over their data sets. (Full disclosure: I work for Snowplow Analytics) -…
Is there a highly-opinionated tutorial that shows how one can get some vanity metrics out from Snowplow?