[dragndrop] Feature request: Clarify drop and replace for single metric control

[michellethomas]

Is your feature request related to a problem? Please describe.
The UX for drop and replace single-select metric is confusing. With a single metric, dragging a new metric in replaces the existing metric. There is no clear indication that some Metric input only accepts one metric.

Describe the solution you'd like
Clarify the drop and replace behavior for the single select metric.

Additional context
Feature request originally mentioned here

[ktmud]

One idea about the solution to this problem is add a small tooltip "Drop to replace metric" upon dragging to MetricControl's drop area.

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[ShaliniIruvuru]

Working fine. The feature is already added.

1.If we want to add multiple metrics.so we have an option under the metric Drop columns/metrics here or click.

Screenshot

Screenshot:-
2.When we have a single metric , so we don’t have an extra option to add metric.