Apple Three-Piece Analytics

When to invoke

• Deciding on an analytics SDK.
• Evaluating Firebase / TelemetryDeck / Mixpanel / Amplitude / Sentry.
• Writing PrivacyInfo.xcprivacy.
• User asks "what metrics should I track", "what can I see without a third-party SDK".

Scope

Owns the source-selection decision and its PrivacyInfo/ATT consequence. Does NOT own MetricKit wiring or payload interpretation → ios-performance-engineering; sink code → telemetry-facade-pattern; App Review privacy-label parity → app-store-review-rejections.

Default decisions

v1 uses the Apple three-piece set