Capturing and storing longs it’s bit painful task. It’s not so bad if you are running one application on one server, but if you go with multiple servers, or just don’t want to “login” to check logs – you have to go with remote logging tools. I know only 2 and didn’t look for more. First of them is tool called Sentry second one is LogEntries .
But the best part of it – you can install it on your own platform, because they have Open Source Sentry version. It’s written in Python – installation is not very complex. Hosted version is better, and you don’t have to worried about traffic. Pricing is reasonable starting from $9.