Handlers are not uniquely identified by their name. Only within the logger to which they are attached is their name unique. This function is here to allow you grab a handler from a logger so you can examine and alter it.
Typical use of this function is in
getHandler(handler, logger = "")
The name of the handler, or its action.
Optional: the name of the logger. Defaults to the root logger.
The retrieved handler object. It returns NULL if handler is not registerd.
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