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sentry-performance-tracing

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Set up performance monitoring and distributed tracing with Sentry. Use when implementing performance tracking, tracing requests, or monitoring application performance. Trigger with phrases like "sentry performance", "sentry tracing", "sentry APM", "monitor performance sentry".

skills/.curated/sentry-performance-tracing/SKILL.md

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# Sentry Performance Tracing

## Overview

Sentry performance monitoring captures distributed traces across your application stack, measuring latency, identifying bottlenecks, and tracking Web Vitals. The v8 SDK uses a span-based API where `Sentry.startSpan()` replaces the deprecated `startTransaction()`. Auto-instrumentation covers HTTP, database queries, and framework routes out of the box. Manual spans let you measure business-critical operations. Combined with profiling (`profilesSampleRate`), you get function-level flamegraphs attached to traces.

## Prerequisites

- Sentry SDK v8+ installed (`@sentry/node` >= 8.0.0 or `sentry-sdk` >= 2.0.0)
- `tracesSampleRate > 0` set in `Sentry.init()` — performance data is not collected at zero
- Performance monitoring enabled in your Sentry project settings (Settings > Performance)
- For distributed tracing: all participating services must have Sentry SDK initialized

## Instructions
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