Add support for extended range selector modifiers smoothed & anchored

CHANGELOG.md

@@ -25,6 +25,7 @@
 * [FEATURE] Query-frontends: Automatically adjust features used in query plans generated for remote execution based on what the available queriers support. #13017 #13164
 * [FEATURE] Memberlist: Add experimental support for zone-aware routing, in order to reduce memberlist cross-AZ data transfer. #13129
 * [FEATURE] Query-frontend and querier: Add experimental support for performing query planning in query-frontends and distributing portions of the plan to queriers for execution. #13058
+* [FEATURE] MQE: Add support for experimental extended range selector modifiers `smoothed` and `anchored`. #13398
 * [ENHANCEMENT] Compactor, Store-gateway: Change default value of `-compactor.upload-sparse-index-headers` to `true`. This improves lazy loading performance in the store-gateway. #13089
 * [ENHANCEMENT] Store-gateway: Verify CRC32 checksums for 1 out of every 128 chunks read from object storage and the chunks cache to detect corruption. #13151
 * [ENHANCEMENT] Ingester: the per-tenant postings for matchers cache is now stable. Use the following configuration options: #13101

pkg/frontend/querymiddleware/roundtrip.go

@@ -264,6 +264,9 @@ func newQueryTripperware(
 	// This enables duration arithmetic https://github.com/prometheus/prometheus/pull/16249.
 	parser.ExperimentalDurationExpr = true
 
+	// This enables the anchored and smoothed selector modifiers
+	parser.EnableExtendedRangeSelectors = true
+
 	var c cache.Cache
 	if cfg.CacheResults || cfg.cardinalityBasedShardingEnabled() {
 		var err error

pkg/querier/querier.go

@@ -197,6 +197,9 @@ func New(cfg Config, limits *validation.Overrides, distributor Distributor, quer
 	// This enables duration arithmetic https://github.com/prometheus/prometheus/pull/16249.
 	parser.ExperimentalDurationExpr = true
 
+	// This enables the anchored and smoothed selector modifiers
+	parser.EnableExtendedRangeSelectors = true
+
 	var eng promql.QueryEngine
 	var streamingEngine *streamingpromql.Engine