Harmonize Legend-Select-Behaviour between Pie Chart & TimeSeries

[tzafke]

What would you like to be added:

• in Grafana we can visualize multiple metrics in one timeseries as well as visualizing multiple metrics in a pie chart
  (that's what pie charts do)
• when activating the legend, we can select legend items by clicking them to show / unshow the visualized series / metrics
• the behaviour of this action differs between
  • panel/graph (panel/timeseries) and panel/piechart
  • panel/graph
    • selecting a legend item exclusively shows the selected item (means unselect all others)
    • selecting / unselecting multiple items is possible with holding shift OR ctrl
      (I learned from Selecting multiple series from graph legend #18477 that is works with shift)
  • panel/piechart
    • "clicking" a legend item selects / unselects the single series / metric w/o any effect to the other items
    • to have only two metrics visaulized I need to click (unselect) all the other metrics and the other way around)
• I can understand that both behaviours have their advantages / disadvantages with the number of metrics as the differentiator when to use what
• I propose the following (combined) behavior for both panels
  • having the current pie chart behavior as a default
    • is very intuitiv
    • in pie charts it should be a very rare usecase to select one item exlusively --> only to have a starting point for "multi-select"
    • but it makes sense to have a feature for "show all again"
  • using the alt key to exclusively select one metric or show all metrics again
    (not using shift, because this also selects the text and expectation for shift is to mark/select everything between 1st selected item to 2nd selected item)
  • having a panel option to generate the current timeseries behaviour. In this case keep it wih ctrl as "multi-select-key"

Why is this needed:

• from my perspective the diffent behaviour is confusing for users
• the current pie chart is lacking the feature of "exclusively select" / "select all again" as far is I know
• from my perspective the behaviour of the panel/graph is not intuitiv but an good option for powerusers. Thats why the
  • the feature should be available via ALT
  • there CAN be an panel option to make that default

Version: 7.3.6

[louislefebvre]

Hello, did you find a way to achieve this? Thank you

[mdvictor]

Hello! I agree that the PieChart should not differ in legend select functionality as to avoid confusion, I'll have a look on fixing this.