Set Up Performance

With performance monitoring, Sentry tracks your software performance, measuring metrics like throughput and latency, and displaying the impact of errors across multiple systems. Sentry captures distributed traces consisting of transactions and spans, which measure individual services and individual operations within those services. Learn more about our model in Distributed Tracing.

Enable Tracing

Configure the Sample Rate

Sampling for transactions must also be configured before

1. Setting a uniform sample rate for all transactions using the tracesSampleRate option in your SDK config to a number between 0 and 1. (For example, to send 20% of transactions, set tracesSampleRate to 0.2.)
2. Controlling the sample rate based on the transaction itself and the context in which it's captured, by providing a function to the tracesSampler config option.

The two options are meant to be mutually exclusive. If you set both, tracesSampler will take precedence.

import * as Sentry from "@sentry/react";

Sentry.init({
  dsn: "https://examplePublicKey@o0.ingest.sentry.io/0",

  // This enables automatic instrumentation (highly recommended), but is not
  // necessary for purely manual usage.
  // If you only want to use manually, remove the BrowserTracing integration and add
  // Sentry.addTracingExtensions() above your Sentry.init() call.
  integrations: [new Sentry.BrowserTracing()],

  // We recommend adjusting this value in production, or using tracesSampler
  // for finer control
  tracesSampleRate: 1.0,
});

Learn more about how the options work in Sampling Transactions.

Verify

Verify that performance monitoring is working correctly by using our automatic instrumentation or by starting and finishing a transaction using custom instrumentation.

While you're testing, set tracesSampleRate to 1.0, as that ensures that every transaction will be sent to Sentry.

Once testing is complete, we recommend lowering this value in production by either lowering your tracesSampleRate value, or switching to using tracesSampler to dynamically sample and filter your transactions.

Leaving the sample rate at 1.0 means that automatic instrumentation will send a transaction each time a user loads any page or navigates anywhere in your app, which is a lot of transactions. Sampling enables you to collect representative data without overwhelming either your system or your Sentry transaction

@sentry/react exports a withProfiler higher order component that can be used to capture React related spans for specific React components.

import * as Sentry from "@sentry/react";

export default Sentry.withProfiler(App);

Learn more about using and customizing the React Profiler in React Component Tracking.

React Router

If you are using react-router, we provide React Router instrumentation to use alongside Sentry Performance Monitoring.

Next Steps: