This read-create INTEGER selects how the start and end time values for a PM instance's collection window are referenced, per its description, none(0) simply starts collection now with no defined end, ignoring any specified times, utc(1) references the Unix Epoch, and relative-to-now(2) references the time the value is set, with none(0) as the default. This determines whether cienaCesPmInstanceStartTimeValue/EndTimeValue should be read as absolute epoch seconds or as a relative offset from 'now', which changes how an automation script must construct those values. An engineer scripting a PM instance to start collecting exactly 10 minutes from now, regardless of wall-clock time, would set this to relative-to-now(2) rather than computing an absolute UTC timestamp.