I operate a number of content websites that have several million user sessions and need a reliable way to monitor some real-time metrics on particular pieces of content (key metrics being: pageviews/unique pageviews over time, unique users, referrers).
The use case here is for the stats to be visible to authors/staff on the site, as well as to act as source data for real-time content popularity algorithms.
We already use Google Analytics, but this does not update quickly enough (4-24 hours depending on traffic volume). Google Analytics does offer a real-time reporting API, but this is currently in closed beta (I have requested access several times, but no joy yet).
New Relic appears to offer a few analytics products, but they are quite expensive ($149/500k pageviews - we have several times this).
Other answers I found on StackOverflow suggest building your own, but this was 3-5 years ago. Any ideas?