Пространство имен Bitrix\Main\Diag

Классы
class	CacheTracker
class	Debug
class	EventLogger
class	ExceptionHandler
class	ExceptionHandlerFormatter
class	ExceptionHandlerLog
class	ExceptionHandlerOutput
class	FileExceptionHandlerLog
class	FileLogger
class	Helper
class	HttpExceptionHandlerOutput
interface	IExceptionHandlerOutput
class	LogFormatter
interface	LogFormatterInterface
class	Logger
class	SqlTracker
class	SqlTrackerQuery
class	SysLogger