Show warnings for lazySeriesSet (#10277)

* Show warnings for lazySeriesSet

* Update changelog

* Update changelog again

CHANGELOG.md

@@ -16,6 +16,7 @@
 * [ENHANCEMENT] Ingester: More efficient CPU/memory utilization-based read request limiting. #10325
 * [BUGFIX] Distributor: Use a boolean to track changes while merging the ReplicaDesc components, rather than comparing the objects directly. #10185
 * [BUGFIX] Querier: fix timeout responding to query-frontend when response size is very close to `-querier.frontend-client.grpc-max-send-msg-size`. #10154
+* [BUGFIX] Query-frontend and querier: show warning/info annotations in some cases where they were missing (if a lazy querier was used). #10277
 * [BUGFIX] Ruler: fix indeterminate rules being always run concurrently (instead of never) when `-ruler.max-independent-rule-evaluation-concurrency` is set. https://github.com/prometheus/prometheus/pull/15560 #10258
 * [BUGFIX] PromQL: Fix various UTF-8 bugs related to quoting. https://github.com/prometheus/prometheus/pull/15531 #10258
 * [BUGFIX] Ruler: Fixed an issue when using the experimental `-ruler.max-independent-rule-evaluation-concurrency` feature, where if a rule group was eligible for concurrency, it would flap between running concurrently or not based on the time it took after running concurrently. #9726 #10189

pkg/storage/lazyquery/lazyquery.go

@@ -116,5 +116,8 @@ func (s *lazySeriesSet) Err() error {
 
 // Warnings implements storage.SeriesSet.
 func (s *lazySeriesSet) Warnings() annotations.Annotations {
-	return nil
+	if s.next == nil {
+		s.next = <-s.future
+	}
+	return s.next.Warnings()
 }