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feat(replay): Re-sample sessions after they expire #8407

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feat(replay): Re-sample sessions after they expire #8407

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@mydea mydea commented Jun 27, 2023

This PR changes the replay session expiry behavior fundamentally.

Old behavior

  • When any session becomes too long (>60min), or the last user activity was >15min ago, we either
    • stop replay when it is an error session
    • or refresh the session if it is a "session" session
  • For non-buffering sessions, after 5 min we pause recording events until a user action happens

New behavior

  • Buffering session never expire and are never paused.
  • When any session (buffer or session) becomes too long, we stop the session and start new sampling
    • Based on sample rates, we call either .start() or .startBufffering() (or nothing if both sample rates are 0).
  • After 5min of inactivity, when not in buffer mode, we pause recording
  • We do not check 15min inactivity anymore, instead sessions continue to max. age and are restarted. The reason is that with the new logic you'd never get into this branch, because you'd always end up in paused state first anyhow.

This is quite a change and touches a bunch of places, and required changes to a bunch of tests. So although it's a bit hard to review, we should be very careful with this. But overall, it appears to be clearer to me anyhow what is happening.

Closes #8257
Closes #8400

@mydea mydea added the Package: replay Issues related to the Sentry Replay SDK label Jun 27, 2023
@mydea mydea requested a review from billyvg June 27, 2023 11:38
@mydea mydea self-assigned this Jun 27, 2023
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github-actions bot commented Jun 27, 2023 •
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size-limit report 📦

Path Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified) 21.95 KB (-0.01% 🔽)
@sentry/browser - ES5 CDN Bundle (minified) 69.13 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified) 20.28 KB (-0.01% 🔽)
@sentry/browser - ES6 CDN Bundle (minified) 60.38 KB (0%)
@sentry/browser - Webpack (gzipped + minified) 21.9 KB (0%)
@sentry/browser - Webpack (minified) 71.51 KB (0%)
@sentry/react - Webpack (gzipped + minified) 21.92 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified) 50.76 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified) 30.33 KB (-0.01% 🔽)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified) 28.2 KB (0%)
@sentry/replay ES6 CDN Bundle (gzipped + minified) 49.42 KB (-0.05% 🔽)
@sentry/replay - Webpack (gzipped + minified) 43.03 KB (-0.3% 🔽)
@sentry/browser + @sentry/tracing + @sentry/replay - ES6 CDN Bundle (gzipped + minified) 69.55 KB (-0.03% 🔽)
@sentry/browser + @sentry/replay - ES6 CDN Bundle (gzipped + minified) 61.82 KB (-0.04% 🔽)

billyvg
billyvg reviewed Jun 28, 2023
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I've only taken a quick glance at this, but the approach seems sound to me. Will have to give it a thorough read in the next day or two.

billyvg
billyvg approved these changes Jul 3, 2023
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How can we test this on sentry.io before merging to master?

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mydea commented Jul 4, 2023

We could release an alpha if we're not 100% certain about it!

@mydea mydea mentioned this pull request Jul 4, 2023
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@mydea mydea force-pushed the fn/replay-session-renew branch from 9bc0ee3 to 97784ed Compare July 13, 2023 10:01
mydea added a commit that referenced this pull request Jul 13, 2023
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feat(replay): Re-sample sessions after they expire #8407
8350255
@mydea mydea force-pushed the fn/replay-session-renew branch from 97784ed to 8350255 Compare July 13, 2023 10:49
mydea added a commit that referenced this pull request Jul 13, 2023
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feat(replay): Re-sample sessions after they expire #8407
521f537
@mydea mydea force-pushed the fn/replay-session-renew branch from 8350255 to c59d333 Compare July 17, 2023 15:26
@mydea mydea mentioned this pull request Jul 17, 2023
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fix(replay): Handle edge cases & more logging (#8558)
9c29c8a 
This is a PR to this feature branch:
#8407

* Handle edge case where we stop multiple times (honestly no idea how
this should happen, but apparently it can 😬 )
* Add some more logging for state changes

We can hopefully eventually remove the `traceInternals` checks, but for
now this is an easy solution for debugging in the beta....
@mydea mydea mentioned this pull request Aug 17, 2023
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mydea commented Aug 17, 2023

Close in favor of #8834

@mydea mydea closed this Aug 17, 2023
@mydea mydea deleted the fn/replay-session-renew branch December 3, 2024 09:31
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