fix: metrics of priority queue

Author: shaofan-hs

metrics/priority_queue.go

@@ -57,14 +57,16 @@ var (
 		Subsystem: PriorityQueueSubsystem,
 		Name:      QueueLatencyKey,
 		Help:      "How long in seconds an item stays in priority queue before being requested",
-		Buckets:   prometheus.ExponentialBuckets(10e-9, 10, 10),
+		Buckets: []float64{0.005, 0.01, 0.025, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
+			1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 40, 50, 60},
 	}, []string{"name", "priority"})
 
 	workDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
 		Subsystem: PriorityQueueSubsystem,
 		Name:      WorkDurationKey,
 		Help:      "How long in seconds processing an item from priority queue takes.",
-		Buckets:   prometheus.ExponentialBuckets(10e-9, 10, 10),
+		Buckets: []float64{0.005, 0.01, 0.025, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
+			1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 40, 50, 60},
 	}, []string{"name", "priority"})
 
 	unfinished = prometheus.NewGaugeVec(prometheus.GaugeOpts{