fix: 修正KP计算中百分比值的下限为0

features/pm/performance.go

@@ -321,6 +321,9 @@ func PostKPIReportFromNF(w http.ResponseWriter, r *http.Request) {
 			if *k.Unit == "%" && result > 100 {
 				result = 100
 			}
+			if *k.Unit == "%" && result < 0 {
+				result = 0
+			}
 			kpiCVal.Value = result
 		}