Sampling rate of the collection or production of perfomance indicators.<br/><br/><br/><br/>Supported values are : 1mn, 5mn, 15mn, 30mn, 1h, 24h, not applicable. The values 1 month and 1 year are also defined even if not used for collection. <br/><br/>Note that litterals cannot start by a digit, so they are prefixed by a letter. <br/><br/>For current instantaneous measurements the granularity does not apply which is indicated by the value "NA" (Not Applicable).<br/>