rttMonHistoryCollectionBucketIndex
1.3.6.1.4.1.9.9.42.1.4.1.1.2
When the RttMonRttType is 'pathEcho', this uniquely
defines a bucket for a given value of
rttMonHistoryCollectionLifeIndex. For all other
RttMonRttType this value will be the number of
operations per a lifetime. Thus, this object
increments on each operation attempt.
For a particular value of
rttMonHistoryCollectionLifeIndex, the agent assigns
the first value of 1, the second value of 2, and so
on. The sequence keeps incrementing until the number
of buckets equals rttMonHistoryAdminNumBuckets, after
which the most recent rttMonHistoryAdminNumBuckets
buckets are retained (the index is incremented though).