def wf_distribution_interval?(interval)
      return true if %i[m h d].include?(interval)
      raise Wavefront::Exception::InvalidDistributionInterval
    end
def wf_distribution_interval?(interval)
      return true if %i[m h d].include?(interval)
      raise Wavefront::Exception::InvalidDistributionInterval
    end
Ensure the given argument is a valid distribution interval.
 @param interval [Symbol]
 @raise Wavefront::Exception::InvalidDistributionInterval if the
   interval is not valid