ShapeDefaults.connectorDefaults.hover

<div id="diagram"></div>
<script>
$("#diagram").kendoDiagram({
    shapeDefaults: {
        connectorDefaults: {
            hover: {
                fill: {
                    color: "lightcyan",
                    opacity: 0.7
                },
                stroke: {
                    color: "teal",
                    width: 2
                }
            }
        }
    },
    shapes: [
        { id: "1", x: 100, y: 100, content: { text: "Shape 1" } }
    ]
});
</script>

<div id="diagram"></div>
<script>
$("#diagram").kendoDiagram({
    shapeDefaults: {
        connectorDefaults: {
            hover: {
                fill: "lightpink"
            }
        }
    },
    shapes: [
        { id: "1", x: 100, y: 100, content: { text: "Shape 1" } }
    ]
});
</script>

<div id="diagram"></div>
<script>
$("#diagram").kendoDiagram({
    shapeDefaults: {
        connectorDefaults: {
            hover: {
                stroke: {
                    color: "#0066cc",
                    width: 3
                }
            }
        }
    },
    shapes: [{
        id: "1",
        content: { text: "Monday" },
        x: 100,
        y: 20
    }],
    connections: [{
        from: "1"
    }]
});
</script>