[processor/deltatocumulative]: bugfix - permit advancing start-time #31365
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Description:
The spec allows the
StartTimestamp
of a delta stream to advance over time, without affecting the aggregation.Previously, the running counter was reset with each start-time change. This was violating the spec and also effectively prevented meaningful aggregation as series were reset all the time.
Testing:
A test-case was modified to explicitly check this behavior is permitted and handled correctly.