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Designed for Claude Code, also compatible with Codex and OpenClaw
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+.
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.
// Higher sampling for write operations (mutations are riskier)
if
startsWith
'POST '
startsWith
'PUT '
return
0.25
// Moderate sampling for read APIs
if
startsWith
'GET /api/'
return
0.1
// Low sampling for background work
if
startsWith
'job:'
startsWith
'queue:'
return
0.05
// User-tier sampling (via custom attributes from middleware)
if
'user.plan'
'enterprise'
return
0.5
return
0.05
// Default: 5%
Step 2 — Configure Profiling with profilesSampleRate
The profilesSampleRate controls what fraction of traced transactions get profiled. Setting it to 1.0 with a 5% tracesSampler means 5% of traffic is profiled.
Tuning: Start at profilesSampleRate: 0.1 in production. Profiling adds ~3-5% CPU overhead per profiled transaction. Continuous profiling (profileSessionSampleRate) has lower per-transaction cost but runs on sampled instances continuously.
Names with dynamic IDs (/api/users/12345) create thousands of unique entries, degrading dashboard performance and inflating quota. Route templates go in the name, dynamic values go in attributes.
// BAD — creates thousands of unique transaction entries// GET /api/users/12345, GET /api/users/67890, ...// GOOD — Sentry auto-parameterizes Express/Koa/Fastify routes// GET /api/users/:userId// For custom spans, always parameterize:Sentry.startSpan(
{
name: 'order.process', // No dynamic IDs in nameop: 'task',
attributes: {
'order.id': orderId, // Filterable in Discover queries'order.total_cents': totalCents,
'customer.tier': customerTier,
},
},
async (span) => {
const result = awaitprocessOrder(orderId);
span.setAttribute('order.status', result.status);
return result;
}
);
Detect cardinality issues with a Discover query:
SELECT count(), transaction FROM transactions GROUP BY transaction ORDER BY count() DESC
Step 4 — Add Custom Measurements
Custom measurements appear in the Performance dashboard and can be charted, alerted on, and queried in Discover. Unit types: 'millisecond', 'byte', 'none' (count), 'percent'.
-- Slowest transactions (p95)
SELECT transaction, p95(transaction.duration), count()
FROM transactions WHERE transaction.duration:>1000
ORDER BY p95(transaction.duration) DESC
-- Regression detection (20%+ slower vs last week)
SELECT transaction, p75(transaction.duration),
compare(p75(transaction.duration), -7d) as vs_last_week
FROM transactions GROUP BY transaction
HAVING compare(p75(transaction.duration), -7d) > 1.2
-- Span breakdown for a route
SELECT span.op, span.description, p75(span.duration), count()
FROM spans WHERE transaction:/api/checkout
ORDER BY p75(span.duration) DESC
Output
Dynamic sampling active — health checks at 0%, payments at 100%, defaults at 5%
Profiling enabled with profilesSampleRate or continuous profileSessionSampleRate
Transaction names parameterized — cardinality under 500 unique names
Custom measurements tracking business KPIs alongside latency
