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# Legacy Logging Symbols

Migrate your code away from using these legacy symbols.

## Topics

### Log Messages

[`os_log(_:)`](/documentation/os/os_log(_:))

Adds a new log message to the default subsystem.

[`os_log(_:log:_:)`](/documentation/os/os_log(_:log:_:))

Adds a new log message using an optional log object and log level.

[`os_log(_:dso:log:_:_:)`](/documentation/os/os_log(_:dso:log:_:_:))

Sends a message to the logging system, optionally specifying a custom log object, log level, and any message-format arguments.

[`os_log(_:dso:log:type:_:)`](/documentation/os/os_log(_:dso:log:type:_:))

Sends a message to the logging system, optionally specifying a custom log object, log level, and any message format arguments.


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