App Hang / ANR Rate per screen or activity

### Problem Statement

As an overal rate is helpful, it would be more helpful if it would be possible to have rates per screen to figure out bottlenecks in specific parts of the application.

Customer is planning to implement these dashboards in Q1-2026.
"What can we expect about the delivery timeline for this feature?"

### Solution Brainstorm

_No response_

### Product Area

Unknown

No files, tests, or entry points are named. Start by locating the existing overall App Hang/ANR rate implementation and dashboard data, then determine how screen or activity dimensions are represented. Done means defining and delivering per-screen or per-activity rates, with the expected delivery timeline clarified.

Written by the indexing model from the issue text.