The history bucket type. This determines the depth of each
bucket.
static(1) - A static bucket type indicates the depth of each
bucket is fixed. The depth is specified in
etsysIpSlaConfigHistorySamples.
timed(2) - A timed bucket has a variable bucket depth. The
etsysIpSlaConfigHistoryInterval specifies the
total time for the bucket. To estimate the depth
of the bucket, multiply the history interval by the
expected number of received packets per second.