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This project improves the scaling and grouping of charts. Items include 2 levels X grouping (e.g. by Year and months, shown on Axis as 2 layers of labels); improved datetime and range grouping; multiple Y aggregates for X series grouping (each Y series can use its own aggregate function); multiple Y series grouping (each Y series can have its own grouping key); support linear axis for Line/Bar/Area (non-stacked) charts; datetime scaling support; overflow data handling; steps number customization; integer scale support.
Most items already done in M5. Remaining TBD: items include 2 levels X grouping (e.g. by Year and months, shown on Axis as 2 layers of labels) integer scale support.
2 levels grouping cannot be completed in 2.2 timeframe, it will be done post-2.2. Integer scale support requires complex changes in the autoscale code. We will try to do it in 2.2 though as it shouldn't require api change.
integer scale support is done, user can simply set a number format on the Axis to display the integer portion and it will not duplicate values anymore. I mark this bug as resolved. The 2 levels grouping will be done as part of the cube/chart integraiton in post 2.2
