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This code system http://hl7.org/fhir/audit-event-severity defines the following codes:

Code | Display | Definition
emergency | Emergency | System is unusable. e.g., This level should only be reported by infrastructure and should not be used by applications.
alert | Alert | Notification should be sent to trigger action be taken. e.g., Loss of the primary network connection needing attention.
critical | Critical | Critical conditions. e.g., A failure in the system's primary application that will reset automatically.
error | Error | Error conditions. e.g., An application has exceeded its file storage limit and attempts to write are failing.
warning | Warning | Warning conditions. May indicate that an error will occur if action is not taken. e.g., A non-root file system has only 2GB remaining.
notice | Notice | Notice messages. Normal but significant condition. Events that are unusual, but not error conditions.
informational | Informational | Normal operational messages that require no action. e.g., An application has started, paused, or ended successfully.
debug | Debug | Debug-level messages. Information useful to developers for debugging the application.

# concept[].definition
System is unusable. e.g., This level should only be reported by infrastructure and should not be used by applications.

# concept[].definition
Notification should be sent to trigger action be taken. e.g., Loss of the primary network connection needing attention.

# concept[].definition
Critical conditions. e.g., A failure in the system's primary application that will reset automatically.

# concept[].definition
Error conditions. e.g., An application has exceeded its file storage limit and attempts to write are failing. 

# concept[].definition
Warning conditions. May indicate that an error will occur if action is not taken. e.g., A non-root file system has only 2GB remaining.

# concept[].definition
Notice messages. Normal but significant condition. Events that are unusual, but not error conditions.

# concept[].definition
Normal operational messages that require no action. e.g., An application has started, paused, or ended successfully.

# concept[].definition
Debug-level messages. Information useful to developers for debugging the application.