Mark Lines

Mark lines are static reference lines you can add to Timeseries widgets in the dashboard. They help you quickly see whether a metric is within or outside your defined thresholds. You can add one or more mark lines to any metric displayed on a Timeseries widget, and optionally shade the area beyond a line to highlight warning or critical ranges.

To add mark lines:

1. In Monitoring, open the dashboard that contains the Timeseries widget you want to add mark lines to.

2. Click Author in the top-right to enter authoring mode.

3. Click the card you want to edit. The Card detail sidebar opens on the right.

4. In Data, click ... next to the metric, then select Add mark line. The Mark line dialog appears.
   

5. Configure the fields:
   

   1. Select + Line to add a rule (repeat for additional rules).
   2. In the Value column, choose the operator, enter a numeric value, and select a unit.
   3. In the Color / Label column, pick a color and enter a label (e.g. High or Low).
   4. (Optional) Turn on Color background area to shade the regions that meet your rules.

6. Click the check on the upper-right to save and apply the changes. The mark lines appear on the widget.