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You can also combine the Tootip Field and the datalabel settings to display multiple values. However, the Pie value will only take the first into account.

@Mirnes, @trafalger is correct that pie charts can only display one value at a time. If you want to be able to switch back and forth between values, you can do that using Variables.

Are those two columns mutually exclusive? Is it ever the case that both columns will have values in the same row? If not, then you can use: IFNULL(`Maintenance`,`Disruption`)

If there are cases where both columns could have a value on the same row, then I would suggest appending your data in ETL so that both columns are stacked ontop of each other and then the new single column can be used (if that makes sense, I don't know the details of your data)

The forecasting chart has fields where you can plug in lower/upper bounds of forecasts.

KB article on forecasting chart