SLA (service-level agreement) indicators alert board members if any cards on the board have breached SLAs.

Board members can enable SLA indicators from the board configuration menu. The setting applies to the current user only.
Figure 1. Enable SLA
enable SLA

When SLA indicators are enabled, a status bar appears on each card that has an associated SLA. If any cards have breached SLAs, an alert appears at the top of the board and a filter option appears in the quick panel. The indicator displays the elapsed percentage of the SLA. If there are multiple SLAs associated with a task card, the indicator displays the status of the SLA with the greatest elapsed percentage.

Figure 2. Visual Task Board with SLA indicators enabled
Visual Task Board with SLA indicators enabled