Registry: The Monolog\Registry class lets you configure global loggers that you
can then statically access from anywhere. It is not really a best practice but can
help in some older codebases or for ease of use.
ErrorHandler: The Monolog\ErrorHandler class allows you to easily register
a Logger instance as an exception handler, error handler or fatal error handler.
ErrorLevelActivationStrategy: Activates a FingersCrossedHandler when a certain log
level is reached.
ChannelLevelActivationStrategy: Activates a FingersCrossedHandler when a certain
log level is reached, depending on which channel received the log record.