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Guides profiling of this repo's matching engine on macOS: records reproducible xctrace (Instruments) launch commands, includes runnable helpers under this skill's scripts/ directory, polls HTTP matcher state alongside CPU profiling (Time Profiler, sample(1), or external traces), and produces PROFILE_REPORT.md with markdown tables for combined hotspot-and-state analysis. Use when profiling matchengine_rust, Instruments, xctrace Time Profiler, engine HTTP summary/status correlation, or Kafka publish backlog investigations.

Analyze scanner_eth synchronization logs for sync success rate, duplicate writes, node load, retry behavior, task backlog, storage throughput, and sync progress. Use when the user asks to analyze logs, diagnose sync health, compare node performance, investigate duplicate writes, or summarize scanner runtime status.