[wahnfrieden]

An honest question: what use are realtime metrics if you can't act on them in realtime? If it takes a day or more to gather enough data to make a decision and react to it with code or otherwise, then anything more than daily metrics seem like a distraction. I suppose it can be useful if you have some automated systems in place or if you're using it for alarms.

[jphackworth]

If you're pushing changes to production many times a day, you can use realtime metrics to notice if anything goes awry, and know when you should roll back. It won't give you the same nuances as an A/B test over a month, but it's a great way to do a quick double check to keep things moving quickly while avoiding disaster.