[Lens] Support bullet/gauge chart

[flash1293]

elastic-charts support gauge/goal charts: https://elastic.github.io/elastic-charts/?path=/story/goal-alpha--vertical-bullet

We should support this chart type in Lens as well. A first version could simply show them without color scheme.

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[ghudgins]

related discuss issue - https://discuss.elastic.co/t/kibana-speedometer/274317/1

...and another one - https://discuss.elastic.co/t/gauge-chart-with-maximum-range-as-the-total-number-of-documents/275015

[ghudgins]

interesting requirement in this discuss issue for a dynamic threshold on a goal visualization https://discuss.elastic.co/t/use-field-of-a-document-as-ranges-value-in-a-goal-visualization/275799

edit: and another dynamic threshold in a goal vis - https://discuss.elastic.co/t/display-a-gauge-from-the-time-of-the-last-received-log/274088

[myasonik]

Flagging a new a11y feature that's coming in Charts really soon: adding semantic meaning to colors. (elastic/elastic-charts#1218)

Explicit docs are also incoming (elastic/eui#4916) but there's not much for this.

Just something we need to keep in mind while building out support that we have an a11y specific feature to support as well.

[timroes]

@ghudgins I think we should consider that when building the UI for the color stops in gauges to allow the user to configure those semantic information on the chart ranges. Since those won't have yet a visible representation in the charts I think we might want to pack that input into some "advanced" popover?

[flash1293]

@timroes As we will reuse the existing color stops UI I think we should tackle this holistically and apply the same changes for all places we are using it (table, and soon heatmap and metric). I would like to split that out from the gauge work.

[ghudgins]

per a discussion with @gvnmagni - we'd like to put the vis title / display name above the bullet instead of to the left. in the longer run, when we have small multiples, we want to have this horizontal title option but right now it's not optimal use of space. CC @markov00 @MichaelMarcialis lmk if I wrote anything wrong here

[mbondyra]

That has to be exposed as an option in elastic charts, right? @markov00

[markov00]

@mbondyra yes elastic/elastic-charts#1507