Show the max and min values in a chart

[Spectre5]

Is there any easy way to mark the maximum and minimum values on a plot? I have a plot with a handful of lines (of temperature) and I'd like to see the highest and lowest values at a glance.

[dbuezas]

You can add the same sensor on a second entity, set the mode: markers+text and remove all but the maximum datapoints:

mode: markers+text
filters:
   - fn: |
        ({ys})=>{
            let max = Number.NEGATIVE_INFINITY;
            let min = Number.POSITIVE_INFINITY;
            for ( const y of ys) {
                max = Math.max(y, max);
                min = Math.min(y, min);
            }
            return { ys: ys.map(y => y == max || y == min ? y : null)};
        }

[Spectre5]

This did work to create a point. how do we add a label to each of the two extrema points?

[Spectre5]

Looks like this will probably put me on the right path:
#309

[dbuezas]

Oh well found. I thought this sounded familiar!