actually register the gauage

pkg/costmodel/router.go

@@ -915,6 +915,7 @@ func Initialize(additionalConfigWatchers ...ConfigWatchers) {
 	prometheus.MustRegister(gpuGv)
 	prometheus.MustRegister(totalGv)
 	prometheus.MustRegister(pvGv)
+	prometheus.MustRegister(spotGv)
 	prometheus.MustRegister(RAMAllocation)
 	prometheus.MustRegister(CPUAllocation)
 	prometheus.MustRegister(PVAllocation)