Sentry – Open Source Event Logger And Aggregator

Sentry is an open source web application that can log application events and aggregate them in realtime.

The ability to monitor events is very useful considering it is possible to know any issues when they happen.

Also, using Sentry, we can easily see the trends of events (errors, warnings, 404, etc.) which is also nice to have a strong opinion about their frequency.

The application supports adding multiple projects and users (with each user having their own custom rights).

It is built with Python but comes with a complete API (for adding and getting events) that can be used with any language (libraries for PHP, Ruby, JavaScript, Java, Node.js exist).