Product & Analytics / Performance & Reliability
Apdex Apdex (Application Performance Index)
A single 0-to-1 score summarizing how many responses were fast enough to keep users satisfied.
The fork, why two teams get different numbers
Apdex is defined by a threshold T that you choose, and the CHOICE OF T is the whole argument.
In the Metric Library
- The full fork, both definitions worked all the way through
- The trap that makes the number lie, on a real export
- Every formula variant, spelled out
- The reconciliation anchor, what to tie it to and when to refuse
Reference: Apdex Alliance specification cited as reference (threshold and bucket definitions) · not reproduced; performance-engineering convention