Team Velocity Chart answers the following questions:
What is the productivity trend for a particular team?
How does a team deliver on its sprint commitment?
To what extent sprint’s scope is subject to change?
Use it as one of gadgets on your Jira Dashboard.
https://brokenbuild.atlassian.net/wiki/spaces/VEL/pages/3124690945 article gives the essential information on how to configure and read Team Velocity Chart.
Refer https://brokenbuild.atlassian.net/wiki/spaces/VEL/pages/3131179293 article if you don’t know how to add “Team Velocity Chart” gadget to your Jira Dashboard.
https://brokenbuild.atlassian.net/wiki/spaces/~503243278/pages/3130753025/Chart+configuration#Team-Velocity-Chart-configuration explains the chart configuration, particularly each setting.