Discovered a specific scenario where the raw-to-hour datum aggregation process can result in a "hole" (no hourly aggregate) when one should have been generated. The requirements for this situation are, starting with a "stale hour" aggregation record on a single datum stream:

1. the previous datum's hour is more than 1 hour earlier than the stale hour
2. a datum exists exactly on the stale hour's start

Example raw data:

Expected hour aggregate data:

Actual hour aggregate data:

Notice how the 15:00 = 2 hour is missing.