I've noticed that when I do an aggregation on timestamps, the full date will not always be displayed. When interval is > 60m the time is fully displayed with formatYYYY-MM-DD HH:mm but when interval is small, it only displays HH:mm making it harder to know which day it was.
Here is an illustration of the two cases, created with the Errors count over time visualization from demo.elastic.co (so I guess it's the last version)
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