Specifies options for the gauge's marker(s).
A marker is a small pointer that indicates a fixed value on a scale. If you need to mark a single value, assign an object defining a marker to the markers configuration object. In the marker's object, specify the value to be indicated, and define the marker's appearance and location.
If you need to indicate several values on a scale, specify markers as an array of objects defining markers. If you need to set similar values to properties of several markers, use the commonMarkerSettings configuration object. It exposes the properties that can be specified for all markers at once. Note that the values specified for a marker individually (in the markers array) override the values that are specified for all markers (in the commonMarkerSettings object).
To define a marker individually, use the properties listed in the markers object. In addition, any property of the commonMarkerSettings configuration object can be added to the marker's individual definition. For example, even though a common type is specified in the commonMarkerSettings, an individual type can be specified for each marker.
Specifies the value that the current marker indicates.