MetricKit

1. Essentials

   Covers Monitoring app performance with MetricKit, Analyzing app performance with MetricKit, Track performance by app state using MetricKit, MetricKit updates.

2. Performance improvements

   Covers Improving your app’s performance.

3. Metric and diagnostic reports

   Covers MetricManager, MetricReport, DiagnosticReport.

4. Result types

   Covers MetricResult, MetricGroup, DiagnosticResult.

5. Time-in-use metrics

   Covers TotalForegroundTimeMetric, TotalBackgroundTimeMetric, TotalBackgroundAudioTimeMetric, TotalBackgroundLocationTimeMetric.

6. Launch and responsiveness metrics

   Covers TimeToFirstDrawMetric, OptimizedTimeToFirstDrawMetric, ApplicationResumeTimeMetric, ExtendedLaunchMetric.

7. CPU and memory metrics

   Covers CPUTimeMetric, CPUInstructionsCountMetric, CPUExceptionDiagnostic, PeakMemoryMetric.

8. GPU and display metrics

   Covers GPUTimeMetric, MetalFrameRateMetric, PixelLuminanceMetric, AveragePixelLuminance.

9. Network metrics

   Covers TotalWiFiUploadMetric, TotalWiFiDownloadMetric, TotalCellularUploadMetric, TotalCellularDownloadMetric.

10. Disk metrics

    Covers LogicalDiskWritesMetric, DiskWriteExceptionDiagnostic, TotalDiskSpaceCapacityMetric, TotalFileCountMetric.

11. Termination metrics

    Covers ForegroundTerminationMetric, BackgroundTerminationMetric.

12. Signpost and custom metrics

    Covers SignpostIntervalMetric, mxSignpost(_:dso:log:name:signpostID:_:_:), mxSignpostAnimationIntervalBegin(dso:log:name:signpostID:_:_:).

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

• Messages App Services
• Metal Graphics and Games
• Metal Performance Shaders Graphics and Games
• Metal Performance Shaders Graph Graphics and Games
• MetalFX Graphics and Games
• MetalKit Graphics and Games
• MIDIDriverKit System
• ML Compute System
• Model I/O Graphics and Games
• Multipeer Connectivity App Services
• Music Understanding App Frameworks
• MusicKit Media