retrieves a handler from a logger.
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 setLevel(newLevel, getHandler(...)).
the name of the handler, or its action.
optional: the name of the logger. defaults to the root logger.
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