Sentry is a modern error logging and aggregation platform.
Sentry is a Server
The Sentry package fundamentally is just a simple server and web UI. It will handle authenticating SDKs (such as Raven), all of the logic behind storage and aggregation, and alerting team members.
That said, Sentry is not limited to Python. The server is in Python, but it contains a full API for sending events from any language, in any application.