Is it possible to change or add an option to set the gauge node value to "-" or something that indicates that the value is not minimum if nothing has been injected into the node yet?
Configure an inject node that sends the payload with the string -, and set to inject once at startup.
I already did. The minimum value is displayed for a moment, then "-".
It would be more correct if this was the default setting, as it can lead to misinterpretation of the displayed value.
You could submit an feature request issue on the dashboard's github page.
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