[release/8.0] Update table every second, reuse existing metric values if possible #3774
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Backport of #3370 to release/8.0
/cc @adamint
Customer Impact
Tenet: accessibility - compliance. Keyboard users are unable to consistently focus the tabular view of a metric without focus being lost. This impedes their ability to navigate to all rows in the table and understand the metric data.
Testing
Manual testing by myself. Keyboard focus is no longer lost.
Risk
Low risk as there are no visual updates, only a key is added to associate an item with a date.
Regression?
No
Microsoft Reviewers: Open in CodeFlow