MetricKit API Reference

Complete API reference for collecting field performance metrics and diagnostics using MetricKit.

Overview

MetricKit provides aggregated, on-device performance and diagnostic data from users who opt into sharing analytics. Data is delivered daily (or on-demand in development).

When to Use This Reference

Use this reference when:

• Setting up MetricKit subscriber in your app
• Parsing MXMetricPayload or MXDiagnosticPayload
• Symbolicating MXCallStackTree crash data
• Understanding background exit reasons (jetsam, watchdog)
• Integrating MetricKit with existing crash reporters

For hang diagnosis workflows, see axiom-hang-diagnostics. For general profiling with Instruments, see axiom-performance-profiling.