Failure Rate instead of Crash Free Session Rate after integrating Capture App Start Errors

[gkartalis]

What React Native libraries do you use?

React Navigation, RN New Architecture

Are you using sentry.io or on-premise?

sentry.io (SaS)

Are you using any other error monitoring solution alongside Sentry?

No

Other Error Monitoring Solution Name

No response

@sentry/react-native SDK Version

8.13.0

How does your development environment look like?

info Fetching system and libraries information...
System:
  OS: macOS 26.5
  CPU: (12) arm64 Apple M2 Pro
  Memory: 182.81 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 24.6.0
    path: ~/.local/share/mise/installs/node/24.6.0/bin/node
  Yarn:
    version: 4.10.3
    path: ~/.local/share/mise/installs/yarn/4.10.3/bin/yarn
  npm:
    version: 11.5.1
    path: ~/.local/share/mise/installs/node/24.6.0/bin/npm
  Watchman:
    version: 2026.01.12.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /Users/georgioskartalis/.local/share/mise/installs/ruby/3.1.7/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.2
      - iOS 26.2
      - macOS 26.2
      - tvOS 26.2
      - visionOS 26.2
      - watchOS 26.2
  Android SDK:
    API Levels:
      - "30"
      - "31"
      - "34"
      - "35"
      - "36"
    Build Tools:
      - 33.0.1
      - 34.0.0
      - 35.0.0
      - 36.0.0
      - 36.1.0
    System Images:
      - android-30 | Google APIs ARM 64 v8a
      - android-33 | Google Play ARM 64 v8a
      - android-34 | Google Play ARM 64 v8a
      - android-35 | Google Play ARM 64 v8a
      - android-35 | Pre-Release 16 KB Page Size Google Play ARM 64 v8a
      - android-35 | Google Play Tablet ARM 64 v8a
      - android-36.1 | Pre-Release 16 KB Page Size Google Play ARM 64 v8a
      - android-37.0 | 16 KB Page Size Google Play ARM 64 v8a
    Android NDK: Not Found
IDEs:
  Android Studio: 2025.2 AI-252.28238.7.2523.14688667
  Xcode:
    version: 26.2/17C52
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /Users/georgioskartalis/.local/share/mise/installs/java/zulu-17.50.19.0/bin/javac
  Ruby:
    version: 3.1.7
    path: /Users/georgioskartalis/.local/share/mise/installs/ruby/3.1.7/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.2.0
    wanted: 19.2.0
  react-native:
    installed: 0.83.6
    wanted: patch:react-native@npm%3A0.83.6#~/.yarn/patches/react-native-npm-0.83.6-hermes-checksum.patch
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: true

info React Native v0.86.0 is now available (your project is running on v0.83.6).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.86.0
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.83.6&to=0.86.0
info For more info, check out "https://reactnative.dev/docs/upgrading?os=macos".

Sentry.init()

// sentry.options.json:

{
"dsn": "sentryDSN",
"release": "releaseName",
"dist": "dist"
}

Sentry.init({
dsn: sentryDSN,
release: eigenSentryReleaseName(),
dist: eigenSentryDist(),
enableTombstone: true,
enableAutoSessionTracking: true,
enableWatchdogTerminationTracking: false,
attachStacktrace: true,
tracesSampleRate: props.debug ? 1.0 : 0.05,
profilesSampleRate: props.debug ? 1.0 : 0.05,
debug: props.debug,
integrations: [navigationInstrumentation],
...props,
})

Steps to Reproduce

visiting the new release or any other beta in the environment that includes the Capture App Start Errors feature like this link (latest release) https://artsynet.sentry.io/explore/releases/ios-9.11.0-2026.06.18.18/?environment=production&project=5867225

Expected Result

We expected to see the crash free rate metric that was there before

Actual Result

Only failure rate is visible and there is no way for us to check the crash free rate

[linear-code]

RN-679

[antonis]

Thank you for reporting 🙇
We will investigate this and iterate back.

[antonis]

Thanks again for reporting @gkartalis 🙇

visiting the new release or any other beta in the environment that includes the Capture App Start Errors feature like this link (latest release) https://artsynet.sentry.io/explore/releases/ios-9.11.0-2026.06.18.18/?environment=production&project=5867225

Could you check if you see data in any environment from the link you shared (e.g. staging)? Do you set the environment in your configuration?

[gkartalis]

I think the issue is actually on our side @antonis we hardcoded staging into a helper method that we have where it should have been production 🤔 https://github.com/artsy/eigen/pull/13630/changes#diff-f93431d15b5981ca9a3ef1538b1bad0a059b541c31ba42500ef6da9e40638982R107

noticed it after I switched to staging and everything looked like expected

So I am closing this issue we can fix it on our side, thanks for the fast reply though.

[antonis]

Thank you for the feedback 🙇 We are also working on an additional enhancement related to this report in #6330