Instrumenter et interroger EAS Observe

---
name: eas-observe
description: Use for anything related to EAS Observe - adding `expo-observe` to an Expo project (AppMetricsRoot/ObserveRoot HOC, markInteractive and ObserveInteractiveMarker, the useObserve hook, the Expo Router / React Navigation integrations for per-route metrics, the expo-image and Reanimated integrations, user-defined events via `Observe.logEvent`, error reporting via ObserveErrorBoundary and `Observe.reportError`, native crash reporting, source map upload for symbolicated stack traces, and runtime config such as sampleRate and dispatchInDebug), querying via the EAS CLI (`eas observe:metrics-summary`, `observe:metrics`, `observe:routes`, `observe:events`, `observe:session`, `observe:versions`, `observe:errors`, `observe:event`) or the Expo MCP `observe_*` tools, interpreting the resulting metrics (cold/warm launch, TTR, TTI, navigation cold/warm TTR, update download, and the TTI frameRate/device/network params for triaging slow startups), or shipping an Observe integration inside a third-party package.
license: MIT
---

# EAS Observe

> **EAS service - costs apply.** EAS Observe is an Expo Application Services product. The free EAS plan allows up to 10,000 monthly active users, with a limited set of features; higher usage requires a paid subscription. For details, see https://expo.dev/pricing#plan-features.

EAS Observe tracks startup, navigation, and custom-event performance from production Expo apps, and records JavaScript errors and native crashes. It needs a development or production build — the native library is not in Expo Go.

> **Source of truth:** https://docs.expo.dev/eas/observe/ — always consult the canonical docs when API details matter, especially get-started, configuration, integrations, and the metrics reference. EAS Observe is evolving; this skill's references are written to stay accurate but may lag the docs.

## Which reference to read

The five reference files in `./references/` cover what people typically need this skill for:

- **Adding EAS Observe to a project** → [`./references/setup.md`](./references/setup.md). Install, wrap the root layout (`AppMetricsRoot` on SDK 55, `ObserveRoot` on SDK 56+), mark the app interactive (global `markInteractive()` on SDK 55, the `useObserve()` hook or `<ObserveInteractiveMarker />` on SDK 56+), optional per-route navigation metrics through the Expo Router / React Navigation integrations, user-defined events via `Observe.logEvent` (SDK 56+), error reporting, and runtime configuration (sampling, dispatch, environments, custom endpoint).
- **Querying metrics from the terminal** → [`./references/queries.md`](./references/queries.md). The `eas observe:*` commands — `metrics-summary`, `metrics`, `routes`, `events`, `session`, `versions`, `errors`, `event` — with flags, metric aliases, table layouts, JSON shapes, and common workflows. Also the matching `observe_*` tools in the Expo MCP Server, and how their inputs differ from the CLI flags.
- **Reading a dashboard or CLI output** → [`./references/metrics.md`](./references/metrics.md). Target thresholds per metric, what the automatic TTI params mean (`frameRate.*`, `device.*`, `network.*`), and diagnostic patterns for telling slow-but-smooth startup apart from main-thread contention, hard blocks, or throttled devices.
- **Reporting problems from library integrations** → [`./references/library-integrations.md`](./references/library-integrations.md). The current and future integrations that report problems a library detects as events or errors, with their options, limits, and how to query the reports. Currently: `expo-image` (`expo-image.oversized` events for images decoded far larger than the screen) and `react-native-reanimated` (`reanimated.error` errors and optional `reanimated.warning` events).
- **Shipping an Observe integration in a library** → [`./references/third-party.md`](./references/third-party.md). For package authors only (SDK 57+): optional peer dependency, config declaration merging, `Observe.registerIntegration()`, and event naming.

## Quick links to the docs

- Get started: https://docs.expo.dev/eas/observe/get-started/
- Dashboard guide: https://docs.expo.dev/eas/observe/dashboard/
- Querying with EAS CLI: https://docs.expo.dev/eas/observe/eas-cli/
- Querying with the Expo MCP Server: https://docs.expo.dev/eas/observe/mcp/
- Metrics reference: https://docs.expo.dev/eas/observe/reference/metrics/
- Expo Router integration: https://docs.expo.dev/eas/observe/integrations/expo-router/
- React Navigation integration: https://docs.expo.dev/eas/observe/integrations/react-navigation/
- Expo Image integration: https://docs.expo.dev/eas/observe/integrations/expo-image/
- Reanimated integration: https://docs.expo.dev/eas/observe/integrations/react-native-reanimated/
- User-defined events: https://docs.expo.dev/eas/observe/events/
- Error reporting: https://docs.expo.dev/eas/observe/errors/
- Configuration: https://docs.expo.dev/eas/observe/configuration/
- Third-party integrations: https://docs.expo.dev/eas/observe/integrations/third-party/
- EAS Update download performance: https://docs.expo.dev/eas/observe/eas-update/
- Troubleshooting: https://docs.expo.dev/eas/observe/reference/troubleshooting/

## Submitting Feedback
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```bash
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```
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