Alias* functions with conjunction with wildcards does the data interpolation/modification

aliasByNode function shows some undesired/misleading black/“empty cells” and also introduces some out of different system values on timeseries and heatmap graphs
and Graphite datasource.

It suppose to display datapoints 0 , 0.5 and 1 but instead of it some times it displays other values and display with different colors in the dashboard.

I have tried is also try to use transform functions (precisely: “rename with regex”) with conjunction with wildcards – and that actually works… But its usage is not straightforward.

using alias with conjunction with any of wildcards (*) or selectors (eg. [0-9]) increases artificially the number of datapoints as well as makes our graphs rendering very slow!

any workarounds on avoiding undesired/misleading black/“empty cells and different system values on timeseries and heatmap graphs with Graphite datasource. ?