Line Charts
A line chart is a type of chart used to show information that changes over time. Line charts are created by plotting a series of several points and connecting them with a straight line. Line charts can be used to track changes over short and long periods.
Add Line Chart
Step 1: Select Line Chart Panel

Step 2: You should see options to customise the Title of the chart and data source for the Panel.

For example:

Step 3: You can also customise the View options by switching to the view tab.

You can customise the graph in the following ways:
Displaying an area chart

Connecting null values on the graph

Displaying points or markers in the graph as well as changing the line width

Displaying a line for threshold value in the graph

Custom range for Y-axis

Step 4: You can also customise the Axis settings of the graph

Step 5: When you are satisfied with the customisations, click on Submit to add the Line Chart Panel to the Dashboard.