Summary
Related to elastic/kibana#85793
It would be beneficial to have an option in the charts to always tooltip for instances where multiple charts are synced, but an individual chart instance cannot show a value because of an empty bucket in the data. In this case we'd like to show a custom tooltip message like "Metric: N/A" or similar.

Example of current tooltip behaviour

Summary
Related to elastic/kibana#85793
It would be beneficial to have an option in the charts to always tooltip for instances where multiple charts are synced, but an individual chart instance cannot show a value because of an empty bucket in the data. In this case we'd like to show a custom tooltip message like "Metric: N/A" or similar.
Example of current tooltip behaviour