Emit more histogram buckets for cortex-querier_storegateway_refetches_per_query (#6570)

Signed-off-by: SungJin1212 <[email protected]>

Author: SungJin1212

Diff for: CHANGELOG.md

@@ -3,6 +3,7 @@
 ## master / unreleased
 
 * [FEATURE] Querier/Ruler: Add `query_partial_data` and `rules_partial_data` limits to allow queries/rules to be evaluated with data from a single zone, if other zones are not available. #6526
+* [ENHANCEMENT] StoreGateway: Emit more histogram buckets on the `cortex_querier_storegateway_refetches_per_query` metric. #6570
 * [ENHANCEMENT] Querier: Apply bytes limiter to LabelNames and LabelValuesForLabelNames. #6568
 * [ENHANCEMENT] Query Frontend: Add a `too_many_tenants` reason label value to `cortex_rejected_queries_total` metric to track the rejected query count due to the # of tenant limits. #6569
 * [BUGFIX] Ingester: Avoid error or early throttling when READONLY ingesters are present in the ring #6517

Diff for: pkg/querier/blocks_store_queryable.go

@@ -123,7 +123,7 @@ func newBlocksStoreQueryableMetrics(reg prometheus.Registerer) *blocksStoreQuery
 			Namespace: "cortex",
 			Name:      "querier_storegateway_refetches_per_query",
 			Help:      "Number of re-fetches attempted while querying store-gateway instances due to missing blocks.",
-			Buckets:   []float64{0, 1, 2},
+			Buckets:   []float64{0, 1, 2, 4, 8},
 		}),
 	}
 }

Diff for: pkg/querier/blocks_store_queryable_test.go

@@ -614,6 +614,8 @@ func TestBlocksStoreQuerier_Select(t *testing.T) {
 				cortex_querier_storegateway_refetches_per_query_bucket{le="0"} 1
 				cortex_querier_storegateway_refetches_per_query_bucket{le="1"} 1
 				cortex_querier_storegateway_refetches_per_query_bucket{le="2"} 1
+				cortex_querier_storegateway_refetches_per_query_bucket{le="4"} 1
+				cortex_querier_storegateway_refetches_per_query_bucket{le="8"} 1
 				cortex_querier_storegateway_refetches_per_query_bucket{le="+Inf"} 1
 				cortex_querier_storegateway_refetches_per_query_sum 0
 				cortex_querier_storegateway_refetches_per_query_count 1
@@ -913,6 +915,8 @@ func TestBlocksStoreQuerier_Select(t *testing.T) {
 				cortex_querier_storegateway_refetches_per_query_bucket{le="0"} 0
 				cortex_querier_storegateway_refetches_per_query_bucket{le="1"} 0
 				cortex_querier_storegateway_refetches_per_query_bucket{le="2"} 1
+				cortex_querier_storegateway_refetches_per_query_bucket{le="4"} 1
+				cortex_querier_storegateway_refetches_per_query_bucket{le="8"} 1
 				cortex_querier_storegateway_refetches_per_query_bucket{le="+Inf"} 1
 				cortex_querier_storegateway_refetches_per_query_sum 2
 				cortex_querier_storegateway_refetches_per_query_count 1
@@ -1850,6 +1854,8 @@ func TestBlocksStoreQuerier_Labels(t *testing.T) {
 				cortex_querier_storegateway_refetches_per_query_bucket{le="0"} 1
 				cortex_querier_storegateway_refetches_per_query_bucket{le="1"} 1
 				cortex_querier_storegateway_refetches_per_query_bucket{le="2"} 1
+				cortex_querier_storegateway_refetches_per_query_bucket{le="4"} 1
+				cortex_querier_storegateway_refetches_per_query_bucket{le="8"} 1
 				cortex_querier_storegateway_refetches_per_query_bucket{le="+Inf"} 1
 				cortex_querier_storegateway_refetches_per_query_sum 0
 				cortex_querier_storegateway_refetches_per_query_count 1
@@ -2078,6 +2084,8 @@ func TestBlocksStoreQuerier_Labels(t *testing.T) {
 				cortex_querier_storegateway_refetches_per_query_bucket{le="0"} 0
 				cortex_querier_storegateway_refetches_per_query_bucket{le="1"} 0
 				cortex_querier_storegateway_refetches_per_query_bucket{le="2"} 1
+				cortex_querier_storegateway_refetches_per_query_bucket{le="4"} 1
+				cortex_querier_storegateway_refetches_per_query_bucket{le="8"} 1
 				cortex_querier_storegateway_refetches_per_query_bucket{le="+Inf"} 1
 				cortex_querier_storegateway_refetches_per_query_sum 2
 				cortex_querier_storegateway_refetches_per_query_count 1