When aggregating line graphs by days the series shown is two dimensional, when changing the aggregation to month or year the series is shown as one dimensional. I suspect the two dimensional graph is a bug, please advise.
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In this case, this is not a bug, it's a new behavior in which the line shown represents the range of the values (from minimum to maximum). This is an automatic setting and it's bound to the zoom level. If you zoom in, it's likely to see a single line, and when you zoom out you gonna se this line representing the range of the values.
I hope this can help.
Thanks Christian for that explanation.