I always have to Google it. http://stackify.com/errors-log-management/ Dunno why it's not more discoverable. Maybe they're doing tests, because it's underpriced IMO. I've not found any service like them - maybe New Relic but that's 10x the price, last I checked. Azure has something they're pushing in their UI, too, but a brief look made it seem nontrivial to implement.

Apart from that, Stackify is $15/server/mo for the server monitoring and app metrics, IIRC.