iOS ETTrace Performance Use ETTrace for a bounded, symbolicated sampling experiment. Treat capture conditions and symbolication as part of the evidence, not as setup trivia. Contents - Boundary - Capture Contract - Workflow - Interpret the Report - Common Mistakes - Review Checklist - References Boundary This skill owns ETTrace framework/CLI capture, exact-build dSYMs, processed flamegraph JSON, and like-for-like verification. Use Instruments for broad CPU, hitch, energy, or concurrency triage. Use SwiftUI performance guidance for view identity, invalidation, and layout remediation. ETTrace p…