[mirashii]

Quizlet employee here.

For the JS logging you see in some of the screenshots, we use some JS on the client side that watches for errors and fires off a request to us with as much data as on the error as we can collect (in most cases we can get stack traces, which is pretty nice).

In terms of where this all gets stored and aggregated, all of our application level logs are shipped into Elasticsearch, and that's where the aggregations and counts you see in the screenshots come from. All of the application level logs are sent in with a unique identifier per-client so that we can keep track of them that way, as well as tagged by username, IP address, and anything else that might be useful in cross-correlating with logs from the rest of our stack.

If there's any more specific details you're curious about, I'd be happy to elaborate.

[purephase]

This is excellent, thanks for sharing.

What do you use to ship the logs into ES? I'm not familiar with the technologies you're using, but is this in-sourced developed tools? Or, are there OS options for log aggregating in ES that you would recommend?

[philfreo]

You should write a blog post about your usage of elasticsearch/kibana/logstash