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You can use the "min()" function in PromQL to restrict the values of an instant vector to the maximum value of another instant vector. Here is an example query:
min(instantVector1, max_over_time(instantVector2[5m]))
This query takes the minimum value between the instantVector1 and the maximum value of instantVector2 over the past 5 minutes. In other words, it restricts the values of instantVector1 to be no greater than the maximum value of instantVector2 over the past 5 minutes.