[drchaos]

Solo SaaS app dev here. I found Sentry[1] to be the most valuable tool for monitoring what's going on inside my (Django/React) app. Sentry catches every exception/error in front- and backend, then collects and aggregates them, so I get a single ticket/notification for every type of issue, instead of thousands of those for every instance of the same problem.

For me, that's much simpler than trying to log each error and analyze the log later on. I still create application logs, but only read them if I need more information about a problem logged by Sentry (most of the time I don't need that at all, because Sentry collects a lot of context already).

Another plus for Sentry is that it can be self-hosted, which makes GDPR compliance a little bit easier.

Besides that, I use Monitor Scout[2] for checking that my app is still up, and fail2ban[3] to get rid of script kiddies trying to brute-force passwords and stuff.

[1] https://sentry.io/ [2] https://www.monitorscout.com [3] https://www.fail2ban.org/