Sentry vs Bugsnag

It's what Sentry calls [Rollups](https://docs.sentry.io/learn/rollups/]. All individual issues rolled-up can still be drilled down. Also two issues can be merged manually.

Newly discovered issues (i.e. one that isn't rolled-up under and existing one) can generate an instant notification via many means.

Sentry has an official Docker image which means it's likely going to be well reviewed and maintained for a while and it makes it easy to set up.

Sentry is a completely open source tool. It's free to use if you want to run it on your own. If you want to avoid the overhead of running and maintaining another server, it also has a hosted version available at www.getsentry.com

Has support for source maps.

A single Sentry server can be used for various teams/products.

Clear, concise documentation. Plus docs on cross-domain script errors and enabling CORS.

Bugsnag can be set up to send email notifications as soon as exceptions occur. It can also integrate with a number of third-party services that can be used for notifications including Campfire, HipChat, Twilio SMS and custom solutions via Webhook.

Bugsnag integrates with a wide variety of 3rd party tools to automatically create issues or tickets. Integrations include GitHub, BitBucket, UserVoice, Trello and many, many others.

After a two-week full-featured free trial period the user is limited to 2,000 errors/month, 1 user and 1 project.

Bugsnag groups similar exceptions together displaying the number of occurences so that there's no need to deal with each instance of the error separately.

Their documentation was well organized, easy to search through for the platform of choice and quick work of full product integration.

Drop in place integration with Unity 3D, only a simple API Token configuration on game object and everything was up & running with almost zero code written.

Not many products have decided to finally start doing this, phabricator now has a champion.