@classmethod
    def from_worker(cls, settings):
        raise NotImplementedError
L{app.AppLogger} using a logger observer which does not implement
dataset/ETHPy150Open scrapinghub/frontera/frontera/core/components.py/BaseCrawlingStrategy.from_worker--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/test/test_twistd.py/AppLoggerTests.test_unmarkedObserversDeprecated