Progress bar vs. meter

A progress bar fills automatically as the system loads either determinately or indeterminately. A user's actions do not affect the progress bar; it just indicates how long they must wait for the process to finish. A meter indicates how much the user has completed or how far they are in a continuum.

Labels

Use the built-in style for showing a label associated with the meter. By default, the label is start-aligned and an optional value is end-aligned above the track. (In left-to-right languages, this means the label appears on the left and the value on the right; in right-to-left languages, this flips.) The label should be written in sentence case.

When meters appear in a table, you may use the column header as the label. In this case, set labelPosition="side" or use hideLabel if the column header fully describes what each meter represents.

Representing semantic values

Meter variants can be used to represent semantic values by switching variants as the value changes, from positive, to notice, and then to negative. This kind of variant switching should be handled appropriately within the context of your product so that you're setting accurate expectations for your users about the semantic meaning.