Value,Description,Reference
count,The Counter class value is a counter.,[RFC7970]
peak,The Counter class value is a peak value.,[RFC7970]
average,The Counter class value is an average.,[RFC7970]
ext-value,"A value used to indicate that this attribute is
        extended and the actual value is provided using the
        corresponding ext-* attribute.  See Section 5.1.1 of [RFC7970].",[RFC7970]