Trend Image
A trend image, typically an up or down arrow, is an optional element of the live data region. The trend image depicts at a glance the direction of change of the second live data value, which is typically a metric or numerical value.
When a trend image is enabled with the hasLivedataTrendImage property, it can be displayed with a key performance indicator (KPI) instead when only a single KPI is displayed as tile content (either the 1 KPI or the chart and 1 KPI content types).
Note:
Only one trend image can be displayed on a tile. The default location is in the live data area. Therefore, if you want to associate a trend image with KPI data, you should not enable the live data area for the tile. If you enable the live data area, the trend image will be displayed there and not with the KPI data.