Design: UI for managing a chart annotation directly from the chart

Problem

Our users want to be able to quickly add a chart annotation directly from the chart UI.

Proposal

We should allow the user to add an annotation by clicking directly on the chart. We need to extend the below designs to include a form for adding/ editing/ deleting an annotation. The annotations should also include an edit button to allow for editing of the annotations directly in the chart UI.

Add annotation Pop-up menu option Hover Edit annotation
Add_annotation Add_annotation_menu_pop-up Add_annotation_menu_pop-up_hover Metrics_chart_annotation_with_labels_and_edit

cc @dhershkovitch

Edited by Nadia Sotnikova