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# ARKit ARSession Failures

Analyze details about ARKit ARSession failures.

## Overview

The data in this report contains information about ARKit ARSession failures.

- Territories: Worldwide
- Platforms: iOS, iPadOS.  For more information about iOS and iPadOS, see the Platforms section in [Data Completeness and Corrections](/documentation/Analytics-Reports/data-completeness-corrections).
- Availability:
  - Daily: Every day.
- History: On request, data is available beginning with iOS 17.4 and iPadOS 17.4.
- Completeness: Data from devices that contribute to this report can arrive as late as 8 days after the date it generates on device. You can download recent data daily, but it might be incomplete, and data updates incrementally daily, until all late-arriving events are available.
- Privacy:
  - Includes data from users who have opted to share their data with Apple and developers.
  - Individual rows will only appear if they have a value of 5 or more.
- Data Context: You can analyze your data with additional context by comparing it with the data in the [App Sessions Context](/documentation/Analytics-Reports/app-sessions-context) report, which provides a count of unique devices that use your app on a specific day. For example, if your app performed an action detailed in this report on 10 unique devices on a specific day, and the App Sessions Context report shows there were 100 unique devices running your app that day, then you can approximate that 10% of the devices running your app performed that action.

## Report Fields

|Report Field              |Description                                                    |Data Type|
|--------------------------|---------------------------------------------------------------|---------|
|Count                     |Number of times the event occurred                             |`integer`|
|Territory                 |Country or region in which the event occurred                  |`string` |
|Date                      |Date when the event occurred                                   |`string` |
|Platform                  |OS version on the device on which the event occurred           |`string` |
|Device                    |Type of device on which the event occurred                     |`string` |
|Build                     |Build of device on which event occurred                        |`string` |
|Unique Devices            |The count of unique devices                                    |`integer`|
|Release Type              |Type of software release                                       |`string` |
|ARKit Error Code          |The ARKit error code                                           |`integer`|
|Underlying Error Code     |An identifier, if available, for the system error that occurred|`integer`|
|Time Until Session Failure|The time the ARSession ran until session failure               |`float`  |

## Glossary

|Dimension                 |Value|Definition                            |
|--------------------------|-----|--------------------------------------|
|Time Until Session Failure|0    |Represents range from -Infinity to 0  |
|Time Until Session Failure|1    |Represents range from 0 to 10         |
|Time Until Session Failure|2    |Represents range from 10 to 60        |
|Time Until Session Failure|3    |Represents range from 60 to 300       |
|Time Until Session Failure|4    |Represents range from 300 to 600      |
|Time Until Session Failure|5    |Represents range from 600 to +Infinity|

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