What does HackerNews think of sentry?
Developer-first error tracking and performance monitoring
Language:
Python
It's source available under the BSL: https://github.com/getsentry/sentry. After four years it becomes open source (probably to prevent "AWS Elastic Error Handling service(tm)" from becoming a thing)
You can still run it for your company for free, if you feel like managing all of the infra it requires.