IdentityModelEventSource Event source based logger to log different events.

 LoggerContext A context class that can be used to store work per request to aid with debugging.

 LogHelper Helper class for logging.

 TextWriterEventListener Event listener that writes logs to a file or a fileStream provided by user.

 IdentityModelTelemetryUtil Provides a way to add and remove telemetry data.

 ISafeLogSecurityArtifact Interface that provides an unsafe method to log a security artifact.