Where to get data for the indicators specified in the calculation formula?

Data for the indicators specified in the calculation formula are usually taken from several sources:

• Databases — the main storage of information about transactions, operations, users, and other entities.
• External systems and APIs — if indicators depend on external data (e.g., exchange rates, statistics, equipment performance metrics).
• Logs and monitoring — for indicators related to performance or events.
• Internal services and microservices — if data is aggregated or calculated in other parts of the system.

It is important to ensure the correctness and relevance of the data, as well as the consistency of formats and units of measurement. Often, ETL processes are created for this purpose or intermediate data aggregation layers are used.