[Lens] Area/line charts report last bucket empty

[rajvi-patel-22]

Kibana version: 8.5.0

Elasticsearch version: 8.5.0

Describe the issue:

The new feature was introduced in Kibana [Lens] Show value in legend. This feature is already available in TSVB but there is a minor difference over there. In TSVB, it shows value of last bucket without hovering over the chart. On the other hand, in lens, when this feature is enabled it doesn't show any default values. User must need to hover the chart to see the values.

In Lens,

Scenario 1 : Show value option is enabled and by default it doesn't show any value in the legend.

Scenario 2 : Show value option is enabled and it shows value when hover the chart.

In TSVB,

Scenario 1 : By default it shows value of last bucket in the legend (which is 0).

Scenario 2 : It shows value of count at particular timestamp when hover the chart.

Steps to reproduce:

1. Go to Dashboard > Create Line chart in lens.
2. Click on the Legend > select Show in Display option and enable Show value toggle
   

Expected behavior:

• Lens should show value of last bucket in legend when show value option is enabled and not hovering over the chart.

Actual behavior:

• The value is not shown in the legend by default even when show value option is enabled.

[elasticmachine]

Pinging @elastic/kibana-visualizations @elastic/kibana-visualizations-external (Team:Visualizations)

[stratoula]

The problem here is that the last bucket for area, line charts is empty for some reason, this why you don't see the value in the legend

Bar chart

Area chart