Define which metrics matter and who they are for

Decide which usage metrics to track, define the audience for each (editors, leadership, public), and document the measurement approach before any instrumentation begins.

Start by listing the usage metrics the project may need and grouping each by its intended audience: editors, leadership, or the public. Document the chosen metrics, audience, and measurement approach; the work is done when these decisions are recorded before instrumentation begins.

Written by the indexing model from the issue text.