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There are two built-in logger factories for writing log messages from the Optimizely Log API to .NET Diagnostics Trace; the `EPiServer.Logging.TraceLoggerFactory` and the `EPiServer.Logging.TraceSourceLoggerFactory`.

Note

In Optimizely Digital Experience Platform (DXP), Optimizely logs are redirected into .NET Diagnostic Trace, as long as the code uses the Optimizely logging abstraction `EPiServer.Logging.LogManager`. If you are using log4net and deploying in Optimizely DXP, replace `log4net` with `EPiServer.Logging`. See also [Logging](🔗) for more information on switching logging APIs.

## EPiServer.Logging.TraceLoggerFactory

The `EPiServer.Logging.TraceLoggerFactory` logger redirects all log messages to diagnostics trace.

Optimizely log levelmaps to 
Optimizely Critical and Error Logsystem diagnostics trace error level
Optimizely Warning Log API system diagnostics trace warning level
Optimizely Information Log API system diagnostics trace Information level
Optimizely Debug and Trace Log APInot logged

You enable `EPiServer.Logging.TraceLoggerFactory` like this:



Or from the** episerver.framework** section like this:



## EPiServer.Logging.TraceSourceLoggerFactory

The `EPiServer.Logging.TraceSourceLoggerFactory` redirects all log messages to diagnostics trace source. In this implementation each logger name has its own source switch trace.

Optimizely log levelmaps to 
Optimizely Critical Log API levelsystem diagnostics trace source critical level
Optimizely Error Log API levelsystem diagnostics trace source error level
Optimizely Warning Log API level system diagnostics trace source warning level
Optimizely Information Log API level system diagnostics trace source Information level
Optimizely Debug and Trace Log APIsystem diagnostics Verbose

You can enable the `EPiServer.Logging.TraceSourceLoggerFactory` like this:



Or from the **episerver.framework** section like this:



By default, the logging level is set to the **Error** level. If you need to log lower levels than the Error level you need to configure it in the **system.diagnostics** section like this:



## Register Logger Factory via configuration

To register a logger factory via configuration, you need to add the logger factory type in the **appSettings** section:



Or from **episerver.framework** section:



Note

The **appsetting** section value always has a higher priority than the **episerver.framework** section value.