Basic real time view

[nicokruger]

Would be nice to have a basic version of the real-time view from GA:

• nr. of users, vists, events, pageviews in the last 15 minutes
• graph of the last 4 hours or so that updates real-time
• real time referrer, utm and OS counts

As discussed with @rehanvdm on X/twitter, one way to do this would be to use Kinesis Streams - but that adds a $28 floor cost. Would thus definitely have to make this optional but are there any alternative methods that have a better cost scaling for small sites?