I am also considering Logstash.
I want to add a remote debugging tool for my application, and my application is currently live in 10 countries. So, the scale is quite big. Can you help me choose the best client-side debugging tool? Also, are there any tools available in the market that provide 3rd party server integration too?
Bugfender is mainly focused on getting the application logs, which is very useful for debugging and reproducing errors reported by users. Also has a "user feedback" option, that lets you get feedback from your users and get the application logs alongside it. Bugsnag and Crashlytics are more focused on "error analytics", mostly crashes, and they're more advanced in terms of analytics and detection of trends in crashes. I hope I helped! Disclaimer: I'm one of the founders of Bugfender.