can not disable session tracking and client reports for Next.js

[volker-attempto]

Is there an existing issue for this?

• [X] I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• [X] I have reviewed the documentation https://docs.sentry.io/
• [X] I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/nextjs

SDK Version

7.105.0

Framework Version

7.105.0

Link to Sentry event

No response

SDK Setup

next.config.js

/** @type {import('next').NextConfig} */

const { withSentryConfig } = require('@sentry/nextjs');

const nextConfig = {
  output: 'standalone',
  reactStrictMode: true,
  i18n: {
    locales: ['de'],
    defaultLocale: 'de',
  },
  async redirects() {
    return [
      {
        source: '/',
        destination: '/home',
        permanent: false,
      },
    ];
  },
  sentry: {
    disableServerWebpackPlugin: true, // Disable the Sentry Webpack plugin for server bundles
    disableClientWebpackPlugin: true, // Disable the Sentry Webpack plugin for client bundles
    disableLogger: true,
  },
};

const sentryWebpackPluginOptions = {
  org: '---removed---',
  project: '---removed---',
  environment: process.env.NEXT_PUBLIC_SENTRY_ENVIRONMENT,

  silent: true, // Suppresses all logs
};

module.exports = withSentryConfig(nextConfig, sentryWebpackPluginOptions);
module.exports.env = {
  NEXT_PUBLIC_SENTRY_DSN: process.env.NEXT_PUBLIC_SENTRY_DSN,
};

sentry.client.config.ts

Sentry.init({
  dsn: process.env.NEXT_PUBLIC_SENTRY_DSN,
  environment: process.env.NEXT_PUBLIC_SENTRY_ENVIRONMENT,
  enableTracing: false,
  debug: true,
  // Adjust this value in production, or use tracesSampler for greater control
  tracesSampleRate: 0.0,
  autoSessionTracking: false,
  // Setting this option to true will print useful information to the console while you're setting up Sentry.
  // debug: process.env.NEXT_PUBLIC_SENTRY_DEBUG === 'true',
  sendClientReports: false,
});

Steps to Reproduce

1. start application in prod mode pnpm run start
2. load page in Chrome browser
3. see the session request with payload:

   {"sent_at":"2024-03-07T14:32:52.493Z","sdk":{"name":"sentry.javascript.nextjs","version":"7.105.0"}}
   {"type":"session"}
   {"sid":"93a52e4fe04a4e70a24d2f8d8775ce3f","init":true,"started":"2024-03-07T14:32:52.493Z","timestamp":"2024-03-07T14:32:52.493Z","status":"ok","errors":0,"attrs":{"release":"9sBuGU8rJAON6_VQvPLgv","environment":"local","user_agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"}}

4. show initiator for call: _sendEnvelope <- sendSession <- captureSession <- .... <- onEntrypoint
5. client reports are also sent, when tracesSampleRate is set to 0.0

---

1. start application in dev mode pnpm run dev
2. load page in Chrome browser
3. see client report request with payload:

   {}
   {"type":"client_report"}
   {"timestamp":1709822964.918,"discarded_events":[{"reason":"sample_rate","category":"transaction","quantity":4}]}

Expected Result

Respect the configuration files and make requests to sentry.io only in error case.

Actual Result

dev mode seems to obey the "autoSessionTracking: false" instruction, but still sends client reports, whereas prod mode doesn't care about the configuration at all

When debugging, I can see my provided configuration is somewhere in the code:

But the configuration seems to be unavailable / set to defaults at some other point:

[lforst]

I have to ask this: Did you trigger a rebuild after you changed the settings and before you ran pnpm run start?

[volker-attempto]

I have to ask this: Did you trigger a rebuild after you changed the settings and before you ran pnpm run start?

Yes, my IDE-button, which runs pnpm run start does always a pnpm run build before.

[lforst]

Hi, setting autoSessionTracking: false in sentry.client.config.ts works as expected in my test app. No session events are sent. Would you mind providing a minimal reproduction example? Thank you!

(Before that, I recommend deleting your .next folder once to ensure that no caching or similar swallowed your changes.)

[volker-attempto]

We found the culprit. There was another file included in our _app.tsx from previous sentry implementation attempts. It called Sentry.init with an incomplete configuration object.

Thank you very much for your help!

I hereby close this ticket.