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Expose Android app startup Activity filtering in the React Native SDK

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#1,485 1 comentario 0 reacciones 1 asignado Ver en GitHub

Los mantenedores suelen responder en 2 días

@sbarrio ya está trabajando en esto.

Desde el 9/10/2026.

Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
35/100
Tipo de issue
Nueva funcionalidad
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
kotlin, react-native, typescript
Área
mobile, observability

Línea de trabajo

Start with the workaround in the issue, which overrides buildRumConfiguration() in DdSdkNativeInitialization and calls setAppStartupActivityPredicate on the Android RumConfiguration.Builder. Trace how a TypeScript RUM option would travel through the native bridge into DdSdkConfiguration, and decide whether the field is optional with the current behavior kept as the default. Done means a new androidAppStartupActivityClassNames option that filters startup Activities on Android, with the default unchanged and tests covering both cases.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

enhancement
Feature description

Use case

Android apps can contain secondary Activities that do not represent an app startup. Datadog may treat these Activities as warm starts. We observed time_to_initial_display warm-start vitals lasting up to 58 seconds while the user was already navigating and interacting with the app. These invalid measurements significantly inflate Android startup SLOs.

How the SDK currently delivers

@datadog/[email protected] uses [email protected], which supports RumConfiguration.Builder.setAppStartupActivityPredicate.
However, the React Native SDK does not expose a way to configure that predicate. React Native consumers therefore cannot distinguish their primary React Activity from authentication or other auxiliary Activities without patching the package’s native initialization code.

What we would like to see

Expose an Android-specific React Native configuration option that limits app startup tracking to selected Activity class names:

configuration.androidAppStartupActivityClassNames = [
    'com.example.MainActivity'
];

When unspecified, the SDK could preserve its current behavior for backward compatibility.

Proposed solution

The React Native SDK could:

  1. Add androidAppStartupActivityClassNames?: string[] to its RUM configuration.
  2. Serialize it through the native configuration bridge.
  3. Parse it in the Android DdSdkConfiguration.
  4. Apply it while constructing RumConfiguration:
configuredActivityClassNames?.let { classNames ->
    configBuilder.setAppStartupActivityPredicate { activity ->
        activity.javaClass.name in classNames
    }
}

An alternative would be an Android-native extension point that applications can use to customize RumConfiguration.Builder before RUM initialization.

Other relevant information

Our current workaround patches DdSdkNativeInitialization.buildRumConfiguration():

private const val APP_STARTUP_ACTIVITY_CLASS_NAME =
    "com.example.MainActivity"

@OptIn(ExperimentalRumApi::class)
private fun buildRumConfiguration(
    configuration: DdSdkConfiguration
): RumConfiguration {
    // Existing configuration...

    configBuilder.setAppStartupActivityPredicate { activity ->
        activity.javaClass.name == APP_STARTUP_ACTIVITY_CLASS_NAME
    }

    // Existing configuration...
}
Lenguaje dominante
TypeScript
Estrellas
145
Forks
65
Merge medio
2 d 16 h
PR fusionados (30 d)
20

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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