metrickitlisted

# MetricKit Use MetricKit for low-overhead production telemetry that complements local Instruments and Xcode Organizer analysis. On iOS and iPadOS 27, prefer the Swift-first `MetricManager` report sequences. Keep `MXMetricManager` only in an explicit iOS 26 compatibility branch. > **Beta-sensitive:** The iOS/iPadOS 27 surface below is based on Apple's current beta documentation. It has not been locally compiler-verified because Xcode 27 is unavailable in this environment. Re-check the linked Apple documentation and compile with the shipping Xcode 27 SDK before release. Load [MetricKit Extended and Compatibility Patterns](references/metrickit-patterns.md) when implementing durable ingestion, detailed report analysis, or the iOS 26 compatibility path. ## Contents - [MetricManager Setup](#metricmanager-setup) - [Receiving Metric Reports](#receiving-metric-reports) - [Receiving Diagnostic Reports](#receiving-diagnostic-reports) - [Key Metric Results](#key-metric-results) - [Call Stack Trees](#call-stack-trees) - [Custom Signpost Metrics](#custom-signpost-metrics) - [Durable Export and Upload](#durable-export-and-upload) - [Extended Launch Measurement](#extended-launch-measurement) - [iOS 26 Compatibility](#ios-26-compatibility) - [Xcode Organizer](#xcode-organizer) - [Scope Boundaries](#scope-boundaries) - [Common Mistakes](#common-mistakes) - [Review Checklist](#review-checklist) - [References](#references) ## MetricManager Setup At app launch, create and retain one long-