I can’t find this specific definition in the docs, would you share a screenshot? However, I can find: “The count of tracked entity instances (useful in combination with filters). Aggregation type for the program indicator must be COUNT.”
event_count
The count of events (useful in combination with filters). Aggregation type for the program indicator must be COUNT.
When you count events in a program, it means that you are getting an aggregate number for how many times a specific event happened such as number of births.
enrollment_count
The count of enrollments (useful in combination with filters). Aggregation type for the program indicator must be COUNT.
This gives you an aggregated number for how many enrollments happened in a program.
tei_count
The count of tracked entity instances (useful in combination with filters). Aggregation type for the program indicator must be COUNT.
Number of TEIs enrolled in the program regardless of the number of enrollments (a TEIs in some programs can enroll more than once).