'Cannot edit AWS Dashboard widgets with green borders

I manage some AWS Cloudwatch Dashboards. I have full admin privs and I often edit the dashboard widgets to add/remove new metrics.

Recently I came across some widgets that I cannot edit (though it does allow me to delete...). These widgets have a green border, and a green checkmark icon in the upper left of the widget.

What is the significance of a green bordered widget? Why isn't it editable?

Example of a green bordered widget:

enter image description here



Solution 1:[1]

These might be alarms that have been added to a dashboard. Green or red border indicating alarm status.

Maybe alarms added to dashboards in certain ways do not make a copy. I think, I haven't found supporting documentation

Sources

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Source: Stack Overflow

Solution Source
Solution 1 ThorSummoner