sentry-performance-tuning

# Sentry Performance Tuning ## Overview Optimize Sentry's performance monitoring pipeline to maximize signal quality while minimizing SDK overhead and event volume costs. Covers the v8 SDK API for `@sentry/node`, `@sentry/browser`, and `sentry-sdk` (Python), targeting `sentry.io` or self-hosted Sentry 24.1+. ## Prerequisites - Sentry SDK v8+ installed (`@sentry/node` >= 8.0.0 or `sentry-sdk` >= 2.0.0) - `Sentry.init()` called with a valid DSN before any application code runs - Performance monitoring enabled (`tracesSampleRate > 0` or a `tracesSampler` function) - Access to the Sentry Performance dashboard to verify changes ## Instructions ### Step 1 — Replace Static `tracesSampleRate` with Dynamic `tracesSampler` A flat `tracesSampleRate: 0.1` samples all routes equally. The `tracesSampler` callback makes per-transaction decisions based on route, operation type, and upstream trace context. ```typescript import * as Sentry from '@sentry/node'; Sentry.init({ dsn: process.env.SENTRY_DSN, // tracesSampler replaces tracesSampleRate — do not set both tracesSampler: (samplingContext) => { const { name, attributes, parentSampled } = samplingContext; // Honor parent sampling for distributed trace consistency if (parentSampled !== undefined) return parentSampled ? 1.0 : 0; // Drop noise — health probes, static assets if (name?.match(/\/(health|ready|alive|ping|metrics)$/)) return 0; if (name?.match(/\.(js|css|png|jpg|svg|woff2?|ico)$/)) return 0...