How to change the graphic data interval

How to change the graphic data interval

I set the monitoring interval to 5 Min.
When displaying the interface traffic graphic, if the period set to today,the graphic data interval is 5mins. if the period set to this month, the graphic data interval is 24 hours. Too few data , so the graphic is not representative. How can I change the graphic data interval to 5mins when I set the period to this month? Thanks.
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