beforeSendTransaction not firing

[AbhiPrasad]

Discussed in #6986

^{Originally posted by sassomedia January 31, 2023}
According to the docs, beforeSendTransaction should be called before any event is sent to Sentry but this method is not firing for me at all, neither in React nor in Node/Express.

beforeSendTransaction was introduced with v7.18 and we're using v7.24.2 ("@sentry/react": "7.24.2", "@sentry/node": "7.24.2"). Aside from automatic instrumentation, is there anything else needed to get this method to fire? Does anyone else have issues with this?

[AbhiPrasad]

Hey @sassomedia, thanks for writing in! I could not reproduce this issue on the latest version of the react sdk: https://codesandbox.io/s/before-send-transaction-react-yx1rg2?file=/src/index.tsx

Could you provide a minimal reproduction thats shows beforeSendTransaction not working? Thanks!

[sassomedia]

@AbhiPrasad Thanks for setting this up, which helped me realize that it was a user error! I still had the tracesSampler set to return env === "production" ? 1 : 0.1;. Of course, when locally testing, nothing would come through with just 1%. With the tracesSampler set to 1.0, I see the beforeSendTransaction working as expected.

Sorry for the hassle and thanks for the support! 🙏

[mydea]

No worries, great that it turned out to be working after all!