Log events
Log event is the atomic unit of logging data: every act of logging produces one.
Users are typically not required to create log events manually as numerous logging extensions handle event construction, unless they are building a custom log implementation/decorator.
Structure
Every log event consists of five components:
Level
Levels indicate event severity:
Debug: verbose output, typically disabled in production
Info: neutral messages
Warn: non-critical errors that don't affect the normal operation of the application
Error: unexpected errors that may require human attention
Fatal: critical errors resulting in application shutdown
Timestamp
Timestamp of the event creation. Includes timezone information.
Message template
Template of the log message that may contain placeholders to be filled with values from properties. May be absent in a valid log event.
Properties
Arbitrary key-value data with case-sensitive string keys. May be absent in a valid log event.
Exception
The error associated with the log event. May be absent in a valid log event.
Immutability
Log events are effectively immutable: any changes lead to creation of a new event. LogEvent
class provides a set of special transformation methods:
This ensures thread safety when routing the same event to multiple logs.
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