increase queue duration histogram bucket

Signed-off-by: Ben Ye <benye@amazon.com>

Author: yeya24

pkg/frontend/v1/frontend.go

@@ -108,7 +108,7 @@ func New(cfg Config, limits Limits, log log.Logger, registerer prometheus.Regist
 		queueDuration: promauto.With(registerer).NewHistogram(prometheus.HistogramOpts{
 			Name:    "cortex_query_frontend_queue_duration_seconds",
 			Help:    "Time spend by requests queued.",
-			Buckets: prometheus.DefBuckets,
+			Buckets: []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 20, 30, 60},
 		}),
 	}
 

pkg/scheduler/scheduler.go

@@ -116,7 +116,7 @@ func NewScheduler(cfg Config, limits Limits, log log.Logger, registerer promethe
 	s.queueDuration = promauto.With(registerer).NewHistogram(prometheus.HistogramOpts{
 		Name:    "cortex_query_scheduler_queue_duration_seconds",
 		Help:    "Time spend by requests in queue before getting picked up by a querier.",
-		Buckets: prometheus.DefBuckets,
+		Buckets: []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 20, 30, 60},
 	})
 	s.connectedQuerierClients = promauto.With(registerer).NewGaugeFunc(prometheus.GaugeOpts{
 		Name: "cortex_query_scheduler_connected_querier_clients",