How to design an event tracking system?

An event tracking system allows collecting and analyzing data about user actions or system events. The main steps of design:

1. Defining goals and metrics — what exactly needs to be tracked and why (e.g., clicks, conversions, errors).
2. Choosing events and parameters — which events will be recorded, what attributes to add to them (time, user, context).
3. Data collection tools — client SDKs, server libraries, APIs for sending events.
4. Storage and processing — database or storage (e.g., Kafka, ClickHouse), ETL processes for cleaning and aggregation.
5. Analytics and visualization — dashboards, reports, integration with BI systems.

It is important to ensure minimal impact on performance, reliable data transmission, and scalability. Also, consider event versioning and documentation for the team.