pointer.track.opacityNumber
The opacity of the track.
Example
<div id="gauge"></div>
<script>
$("#gauge").kendoLinearGauge({
    pointer: {
        value: 25,
        shape: "barIndicator",
        track: {
            color: "#ffeb3b",
            opacity: 0.5
        }
    },
    scale: {
        min: 0,
        max: 50
    }
});
</script>
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