Add info field to query response

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 * [FEATURE] Ruler: Experimental: Add `ruler.frontend-address` to allow query to query frontends instead of ingesters. #6151
 * [FEATURE] Ruler: Minimize chances of missed rule group evaluations that can occur due to OOM kills, bad underlying nodes, or due to an unhealthy ruler that appears in the ring as healthy. This feature is enabled via `-ruler.enable-ha-evaluation` flag. #6129
+* [ENHANCEMENT] Query Frontend: Add info field to query response. #6207
 * [ENHANCEMENT] Query Frontend: Add peakSample in query stats response. #6188
 * [ENHANCEMENT] Ruler: Add new ruler metric `cortex_ruler_rule_groups_in_store` that is the total rule groups per tenant in store, which can be used to compare with `cortex_prometheus_rule_group_rules` to count the number of rule groups that are not loaded by a ruler. #5869
 * [ENHANCEMENT] Ingester/Ring: New `READONLY` status on ring to be used by Ingester. New ingester API to change mode of ingester #6163

pkg/querier/tripperware/instantquery/instant_query_test.go

@@ -362,6 +362,15 @@ func TestMergeResponse(t *testing.T) {
 			},
 			expectedResp: `{"status":"success","data":{"resultType":"vector","result":[{"metric":{"__name__":"up","job":"foo"},"value":[1,"1"]},{"metric":{"__name__":"up","job":"bar"},"value":[1,"2"]}]},"warnings":["warning1","warning2","warning3"]}`,
 		},
+		{
+			name: "merge with infos.",
+			req:  &tripperware.PrometheusRequest{Query: "topk(10, up) by(job)"},
+			resps: []string{
+				`{"status":"success","infos":["info1","info2"],"data":{"resultType":"vector","result":[{"metric":{"__name__":"up","job":"foo"},"value":[1,"1"]}]}}`,
+				`{"status":"success","infos":["info1","info3"],"data":{"resultType":"vector","result":[{"metric":{"__name__":"up","job":"bar"},"value":[1,"2"]}]}}`,
+			},
+			expectedResp: `{"status":"success","data":{"resultType":"vector","result":[{"metric":{"__name__":"up","job":"foo"},"value":[1,"1"]},{"metric":{"__name__":"up","job":"bar"},"value":[1,"2"]}]},"infos":["info1","info2","info3"]}`,
+		},
 		{
 			name: "merge two responses with stats",
 			req:  defaultReq,

pkg/querier/tripperware/merge.go

@@ -42,11 +42,15 @@ func MergeResponse(ctx context.Context, sumStats bool, req Request, responses ..
 	}
 	promResponses := make([]*PrometheusResponse, 0, len(responses))
 	warnings := make([][]string, 0, len(responses))
+	infos := make([][]string, 0, len(responses))
 	for _, resp := range responses {
 		promResponses = append(promResponses, resp.(*PrometheusResponse))
 		if w := resp.(*PrometheusResponse).Warnings; w != nil {
 			warnings = append(warnings, w)
 		}
+		if i := resp.(*PrometheusResponse).Infos; i != nil {
+			infos = append(infos, i)
+		}
 	}
 
 	// Check if it is a range query. Range query passed req as nil since
@@ -96,6 +100,7 @@ func MergeResponse(ctx context.Context, sumStats bool, req Request, responses ..
 		Status:   StatusSuccess,
 		Data:     data,
 		Warnings: strutil.MergeUnsortedSlices(warnings...),
+		Infos:    strutil.MergeUnsortedSlices(infos...),
 	}
 	return res, nil
 }

pkg/querier/tripperware/query.proto

@@ -19,6 +19,7 @@ message PrometheusResponse {
   string Error = 4 [(gogoproto.jsontag) = "error,omitempty"];
   repeated tripperware.PrometheusResponseHeader Headers = 5 [(gogoproto.jsontag) = "-"];
   repeated string Warnings = 6 [(gogoproto.jsontag) = "warnings,omitempty"];
+  repeated string Infos = 7 [(gogoproto.jsontag) = "infos,omitempty"];
 }
 
 message PrometheusData {

pkg/querier/tripperware/queryrange/query_range_middlewares_test.go

@@ -34,6 +34,8 @@ func TestRoundTrip(t *testing.T) {
 					_, err = w.Write([]byte(responseBody))
 				} else if r.RequestURI == queryWithWarnings {
 					_, err = w.Write([]byte(responseBodyWithWarnings))
+				} else if r.RequestURI == queryWithInfos {
+					_, err = w.Write([]byte(responseBodyWithInfos))
 				} else {
 					_, err = w.Write([]byte("bar"))
 				}

pkg/querier/tripperware/queryrange/query_range_test.go

@@ -92,8 +92,10 @@ func TestResponse(t *testing.T) {
 	t.Parallel()
 	r := *parsedResponse
 	rWithWarnings := *parsedResponseWithWarnings
+	rWithInfos := *parsedResponseWithInfos
 	r.Headers = respHeaders
 	rWithWarnings.Headers = respHeaders
+	rWithInfos.Headers = respHeaders
 	for i, tc := range []struct {
 		body                  string
 		expected              *tripperware.PrometheusResponse
@@ -108,6 +110,10 @@ func TestResponse(t *testing.T) {
 			body:     responseBodyWithWarnings,
 			expected: &rWithWarnings,
 		},
+		{
+			body:     responseBodyWithInfos,
+			expected: &rWithInfos,
+		},
 		{
 			body:                  responseBody,
 			cancelCtxBeforeDecode: true,
@@ -484,6 +490,34 @@ func TestMergeAPIResponses(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "Merge response with infos.",
+			input: []tripperware.Response{
+				mustParse(t, `{"status":"success","infos":["info1","info2"],"data":{"resultType":"matrix","result":[{"metric":{"a":"b","c":"d"},"values":[[1,"1"]]}]}}`),
+				mustParse(t, `{"status":"success","infos":["info1","info3"],"data":{"resultType":"matrix","result":[{"metric":{"a":"b","c":"d"},"values":[[1,"1"]]}]}}`),
+			},
+			expected: &tripperware.PrometheusResponse{
+				Status: StatusSuccess,
+				Infos:  []string{"info1", "info2", "info3"},
+				Data: tripperware.PrometheusData{
+					ResultType: matrix,
+					Result: tripperware.PrometheusQueryResult{
+						Result: &tripperware.PrometheusQueryResult_Matrix{
+							Matrix: &tripperware.Matrix{
+								SampleStreams: []tripperware.SampleStream{
+									{
+										Labels: []cortexpb.LabelAdapter{{Name: "a", Value: "b"}, {Name: "c", Value: "d"}},
+										Samples: []cortexpb.Sample{
+											{Value: 1, TimestampMs: 1000},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
 		{
 			name: "Merging of samples where there is complete overlap.",
 			input: []tripperware.Response{

pkg/querier/tripperware/queryrange/queryrange.proto

@@ -17,6 +17,7 @@ message PrometheusResponse {
   string Error = 4 [(gogoproto.jsontag) = "error,omitempty"];
   repeated tripperware.PrometheusResponseHeader Headers = 5 [(gogoproto.jsontag) = "-"];
   repeated string Warnings = 6 [(gogoproto.jsontag) = "warnings,omitempty"];
+  repeated string Infos = 7 [(gogoproto.jsontag) = "infos,omitempty"];
 }
 
 message PrometheusData {

pkg/querier/tripperware/queryrange/results_cache.go

@@ -101,6 +101,7 @@ func (PrometheusResponseExtractor) Extract(start, end int64, from tripperware.Re
 		},
 		Headers:  promRes.Headers,
 		Warnings: promRes.Warnings,
+		Infos:    promRes.Infos,
 	}
 }
 
@@ -116,6 +117,7 @@ func (PrometheusResponseExtractor) ResponseWithoutHeaders(resp tripperware.Respo
 			Stats:      promRes.Data.Stats,
 		},
 		Warnings: promRes.Warnings,
+		Infos:    promRes.Infos,
 	}
 }
 
@@ -130,6 +132,7 @@ func (PrometheusResponseExtractor) ResponseWithoutStats(resp tripperware.Respons
 		},
 		Headers:  promRes.Headers,
 		Warnings: promRes.Warnings,
+		Infos:    promRes.Infos,
 	}
 }
 
@@ -600,6 +603,7 @@ func convertToTripperwarePrometheusResponse(resp tripperware.Response) tripperwa
 		Error:     r.Error,
 		Headers:   r.Headers,
 		Warnings:  r.Warnings,
+		Infos:     r.Infos,
 	}
 }
 
@@ -621,6 +625,7 @@ func convertFromTripperwarePrometheusResponse(resp tripperware.Response) tripper
 		Error:     r.Error,
 		Headers:   r.Headers,
 		Warnings:  r.Warnings,
+		Infos:     r.Infos,
 	}
 }