Sentry is not for logging really. It's designed for errors/exceptions. I believe you should use rollbar/sentry/airbrake regardless of whether you use centralised logging. Or even before it.
+1 for sentry. You can actually self host it for free too!
Another +1 for sentry. I used it (basically accidentally) for a year because it's part of the cookiecutter-django framework[1]. I don't think there was a single issue with it the whole time we used it.