Automatically captured data

BugSnag automatically captures a variety of data to help you debug your errors. You may wish to avoid capturing some types of data, particularly if there are privacy implications for your users.

User information

User information is used to show you which errors are impacting the most users. Set your own user identifiers if you want to be able to find errors affecting individual users.

If no user ID is set on the Bugsnag client, a Bugsnag-generated Device ID is used for the user.id property of BugsnagEvent and BugsnagSession objects. To prevent collection, set an initial value in the Bugsnag client or update the data in an event callback and a session callback block.

Device information

Information about the device can be useful to identify if an error is only occurring on some devices.

To see the data collected about a user’s device, see the device property of the BugsnagEvent and BugsnagSession objects. To prevent collection, update the data in an event callback and a session callback block.

In addition, the following data is collected and added to the metadata field of a BugsnagEvent. This data can be removed by clearing the following keys from metadata:

Section	Key	Description
device	batteryLevel	Amount of battery charge available at time of report
device	simulator	A boolean value which is true if the device is a simulator
device	charging	A boolean value which is true if the device is charging its battery
device	wordSize	Word size of OS (32-bit or 64-bit)
device	thermalState	The device’s thermal condition
device	timezone	The device’s timezone

Application information

Information about the application can be useful to identify if an error occurs in certain versions.

To see the data collected about your app, see the app property of the BugsnagEvent and BugsnagSession classes. To prevent collection, update the data in an event callback and a session callback block.

In addition, the following data is collected and added to the metadata field of a BugsnagEvent. This data can be removed by clearing the following keys from metadata:

Section	Key	Description
app	freeMemory	How much additional memory the app may allocate before reaching its memory limit, as reported by os_proc_available_memory()
app	memoryLimit	The app’s memory limit
app	memoryUsage	The app’s memory footprint
app	name	The name of the executable, set from CFBundleExecutable

Error information

Modifying error information may affect error grouping.

To see the data collected about a captured error/signal, see the errors property of the BugsnagEvent class. To prevent collection, update the data in an event callback block.

Additional data is added to a metadata tab where possible. An nserror tab is created for NSError objects (including Swift errors) passed to notifyError. It will contain:

Section	Key	Description
nserror	code	The error code (error.code)
nserror	domain	The error domain (error.domain)
nserror	reason	The error’s failure reason (error.localizedFailureReason)
nserror	userInfo	The error’s user info dictionary (error.userInfo)

An uncaught NSException or C++ exception will have an error metadata tab that contains (where applicable):

Section	Key	Description
error	address	The memory address that was being accessed when the exception was thrown
error	crashInfo	The message from the crashing library’s __crash_info section
error	nsexception, cpp_exception	A dictionary of details about the original exception
error	reason	The reason for the error
error	type	The error type (nsexception or cpp_exception)

Breadcrumbs

Breadcrumbs are automatically recorded for common actions and can be helpful to reproduce errors.

The following breadcrumbs are collected and can be filtered/amended in a breadcrumb callback block or disabled by its type using enabledBreadcrumbTypes:

Data	Type	Description
NSProcessInfoThermalStateDidChangeNotification	State	Notification when the thermal state of the device changed
NSUndoManagerDidUndoChangeNotification	State	Notification when an undo operation occurs
NSUndoManagerDidRedoChangeNotification	State	Notification when a redo operation occurs
NSHTTPURLResponse	Request (success)	HTTP Response status code in range 100 - 399
NSHTTPURLResponse	Request (failed)	HTTP Response status code in range 400 - 499
NSHTTPURLResponse	Request (error)	HTTP Response status code not in range 100 - 499 or no response received