Session replays dropping

[danerwilliams]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• 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/react

SDK Version

7.99.0

Framework Version

React 18.2.0

Link to Sentry event

No response

SDK Setup

Sentry.init({
    dsn: SENTRY_DSN,
    integrations: [
      new Sentry.BrowserTracing({
        routingInstrumentation: Sentry.reactRouterV6Instrumentation(
          React.useEffect,
          useLocation,
          useNavigationType,
          createRoutesFromChildren,
          matchRoutes
        ),
      }),
      Sentry.replayIntegration({
        maskAllText: false,
        blockAllMedia: false,
        maskAllInputs: false,
      }),
    ],
    environment: getEnvironment(),
    replaysSessionSampleRate: 1.0,
    replaysOnErrorSampleRate: 1.0,
    debug: getEnvironment() === Environment.PROD ? false : true,
  });

Steps to Reproduce

Open the web app and use it as normal, observe that often times (but not always) a session replay never records.

Expected Result

Expected /envelope requests to be sent by the sdk which contain data for session replay, and then the replay becomes available to view in the Sentry dashboard. /envelope requests are sent for the replay_event type along with the encoded data tracking the dom to recreate the recording in Sentry dashboard:

Actual Result

Case 1: /envelope requests are sent, but response throws an error for the envelope exceeding the replay recording size limit:

Case 2: /envelope requests are sent, but no session replay data is ever included, only session type events are sent no replay_event type events:

Sentry logs throw an error for the buffer size exceeding the limit.

[billyvg]

@danerwilliams what is being recorded in the replays? this seems to be expected behavior, the replay segment is too large. is your site public so that we can take a look?

[danerwilliams]

@danerwilliams what is being recorded in the replays? this seems to be expected behavior, the replay segment is too large. is your site public so that we can take a look?

@billyvg

unfortunately am unable to give you access to the logged in site.

Is there no way to increase the frequency that we send replay data if this is too large? we had been using log rocket just fine and are trying to switch.

[billyvg]

@danerwilliams are you recording canvas? I'm curious what's making the segments so large. You can increase the frequency, but it's already set at ~5.5 seconds.