You can view the change history of DB instance parameters or custom parameter templates.
An exported or custom parameter template has initially a blank change history.
in the upper left corner and select a region and a project.You can view the parameter name, original parameter value, new parameter value, modification status, modification time, application status, and application time.
You can apply the parameter template to DB instances as required by referring to Applying a Parameter Template.
in the upper left corner and select a region and a project.You can view the parameter name, original parameter value, new parameter value, modification status, and modification time.