This section includes information about using thresholds in your visualizations. You'll learn about thresholds, their defaults, how to add or delete a threshold, and adding a threshold to a legacy panel.
Thresholds provide one method for you to conditionally style and color your visualizations based on query results. You can apply thresholds to most, but not all, visualizations. For more information about visualizations, refer to [Visualization panels]({{< relref "../visualizations/" >}}).
Delete a threshold when it is no longer needed. When you delete a threshold, the system removes the threshold from all visualizations that include the threshold.
a. Edit the panel to which you want to add a threshold.
b. In the options side pane, locate the **Thresholds** section and click **+ Add threshold**.
c. Select a threshold color, number, and mode.
Threshold mode applies to all thresholds on this panel.
d. For a time-series panel, select a **Show thresholds** option.
1. To delete a threshold, navigate to the panel that contains the threshold and click the trash icon next to the threshold you want to remove.
## Add a threshold to a legacy graph panel
In the Graph panel visualization, thresholds enable you to add lines or sections to a graph to make it easier to recognize when the graph crosses a threshold.
1. Navigate to the graph panel to which you want to add a threshold.
1. On the **Panel** tab, click **Thresholds**.
1. Click **Add threshold**.
1. Complete the following fields:
- **T1 -** Both values are required to display a threshold.
- **lt** or **gt** - Select **lt** for less than or **gt** for greater than to indicate what the threshold applies to.
- **Value -** Enter a threshold value. Grafana draws a threshold line along the Y-axis at that value.
- **Color -** Choose a condition that corresponds to a color, or define your own color.
- **custom -** You define the fill color and line color.
