Since you have nothing in place at the moment, I recommend you get something in place while you are evaluating your options. At honeybadger.io we use papertrai

Since you have nothing in place at the moment, I recommend you get something in place while you are evaluating your options. At honeybadger.io we use papertrail for log monitoring, and we love it, but there are plenty of hosted options. Set up a free trial and you'll at least get aggregation and monitoring now, plus an idea of what kind of logging volume you'll need to support with your self-hosted solution.