Xcode Instruments

1. Performance and metrics

   Overview of Instruments and Xcode profiling tools.

2. Improving your app's performance

   Performance workflow with Instruments and Xcode organizers.

3. Reducing your app's memory use

   Allocations, Leaks and VM Tracker instruments.

4. Diagnosing memory, thread and crash issues early

   Address, thread and undefined behavior sanitizers in Xcode.

5. Logging

   Unified logging with os_log and Console.

6. os_signpost

   Signposts showing intervals in the Instruments timeline.

7. MetricKit

   On-device metrics and diagnostics payloads.

8. Metal debugger

   GPU frame capture and shader debugging.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.