Several widgets have the ability to be compared within a past interval. The referenced interval is configured through the options attribute in the way of amount range ago.

{
  "compare": {
    "range": "minutes" | "hours" | "days" | "weeks" | "months",
    "amount": 2
  }
}

For instance, if we have a widget configured to represent a metric for today (Monday) and we want to compare that metric with the Monday from past week, we have to configure the compare option with range: week and amount: 1.

Also, we can use previous_period as range value, without the needed of complete the amount value.