Required diagnostic data is information about your device, its settings and capabilities, and whether it is performing properly. This is the minimum level of diagnostic data needed to help keep your device reliable, secure, and operating normally. For example, required diagnostic data can be used to determine whether an app or process experiences a performance issue (e.g., the app crashes or hangs) and when a crash-dump file is created on the device (crash dumps themselves are not collected without additional permissions, such as choosing to send Optional diagnostic data).

For a full list of required diagnostic data events and fields that are collected in Windows 11, see http://aka.ms/w11rdd. For Windows 10, see http://aka.ms/w10rdd.