Add /api/v1/query_exemplars route support to query-tee (#5010)

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

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

Author: wgliang

CHANGELOG.md

@@ -4,6 +4,7 @@
 * [ENHANCEMENT] Update Go version to 1.19.3. #4988
 * [ENHANCEMENT] Querier: limit series query to only ingesters if `start` param is not specified. #4976
 * [ENHANCEMENT] Query-frontend/scheduler: add a new limit `frontend.max-outstanding-requests-per-tenant` for configuring queue size per tenant. Started deprecating two flags `-query-scheduler.max-outstanding-requests-per-tenant` and `-querier.max-outstanding-requests-per-tenant`, and change their value default to 0. Now if both the old flag and new flag are specified, the old flag's queue size will be picked. #5005
+* [ENHANCEMENT] Query-tee: Add `/api/v1/query_exemplars` API endpoint support. #5010
 * [FEATURE] Querier/Query Frontend: support Prometheus /api/v1/status/buildinfo API. #4978
 * [FEATURE] Ingester: Add active series to all_user_stats page. #4972
 * [FEATURE] Ingester: Added `-blocks-storage.tsdb.head-chunks-write-queue-size` allowing to configure the size of the in-memory queue used before flushing chunks to the disk . #5000

cmd/query-tee/main.go

@@ -71,6 +71,7 @@ func cortexReadRoutes(cfg Config) []querytee.Route {
 	return []querytee.Route{
 		{Path: prefix + "/api/v1/query", RouteName: "api_v1_query", Methods: []string{"GET"}, ResponseComparator: samplesComparator},
 		{Path: prefix + "/api/v1/query_range", RouteName: "api_v1_query_range", Methods: []string{"GET"}, ResponseComparator: samplesComparator},
+		{Path: prefix + "/api/v1/query_exemplars", RouteName: "api_v1_query_exemplars", Methods: []string{"GET"}, ResponseComparator: nil},
 		{Path: prefix + "/api/v1/labels", RouteName: "api_v1_labels", Methods: []string{"GET"}, ResponseComparator: nil},
 		{Path: prefix + "/api/v1/label/{name}/values", RouteName: "api_v1_label_name_values", Methods: []string{"GET"}, ResponseComparator: nil},
 		{Path: prefix + "/api/v1/series", RouteName: "api_v1_series", Methods: []string{"GET"}, ResponseComparator: nil},