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* otlptranslator: filter __name__ from OTLP attributes to prevent duplicates OTLP metrics can have a __name__ attribute which, when combined with the metric name passed via extras, creates duplicate __name__ labels. This commit implements filtering out of any __name__ metric attribute from OTLP. Also rename TestCreateAttributes to TestPrometheusConverter_createAttributes for consistency, and add test cases for __name__, __type__, and __unit__ OTLP metric attributes. --------- Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>