Add # of series in query response to query stat log

CHANGELOG.md

@@ -17,6 +17,7 @@
 * [FEATURE] Chunk Cache: Support multi level cache and add metrics. #6249
 * [FEATURE] Distributor: Accept multiple HA Tracker pairs in the same request. #6256
 * [FEATURE] Ruler: Add support for per-user external labels #6340
+* [ENHANCEMENT] Query Frontend: Add a number of series in the query response to the query stat log. #6423
 * [ENHANCEMENT] Store Gateway: Add a hedged request to reduce the tail latency. #6388
 * [ENHANCEMENT] Ingester: Add metrics to track succeed/failed native histograms. #6370
 * [ENHANCEMENT] Query Frontend/Querier: Add an experimental flag `-querier.enable-promql-experimental-functions` to enable experimental promQL functions. #6355

pkg/frontend/transport/handler.go

@@ -90,7 +90,7 @@ type Handler struct {
 
 	// Metrics.
 	querySeconds        *prometheus.CounterVec
-	querySeries         *prometheus.CounterVec
+	queryFetchedSeries  *prometheus.CounterVec
 	queryFetchedSamples *prometheus.CounterVec
 	queryScannedSamples *prometheus.CounterVec
 	queryPeakSamples    *prometheus.HistogramVec
@@ -114,7 +114,7 @@ func NewHandler(cfg HandlerConfig, roundTripper http.RoundTripper, log log.Logge
 			Help: "Total amount of wall clock time spend processing queries.",
 		}, []string{"user"})
 
-		h.querySeries = promauto.With(reg).NewCounterVec(prometheus.CounterOpts{
+		h.queryFetchedSeries = promauto.With(reg).NewCounterVec(prometheus.CounterOpts{
 			Name: "cortex_query_fetched_series_total",
 			Help: "Number of series fetched to execute a query.",
 		}, []string{"user"})
@@ -158,7 +158,7 @@ func NewHandler(cfg HandlerConfig, roundTripper http.RoundTripper, log log.Logge
 
 		h.activeUsers = util.NewActiveUsersCleanupWithDefaultValues(func(user string) {
 			h.querySeconds.DeleteLabelValues(user)
-			h.querySeries.DeleteLabelValues(user)
+			h.queryFetchedSeries.DeleteLabelValues(user)
 			h.queryFetchedSamples.DeleteLabelValues(user)
 			h.queryScannedSamples.DeleteLabelValues(user)
 			h.queryPeakSamples.DeleteLabelValues(user)
@@ -338,9 +338,10 @@ func (f *Handler) reportSlowQuery(r *http.Request, queryString url.Values, query
 func (f *Handler) reportQueryStats(r *http.Request, userID string, queryString url.Values, queryResponseTime time.Duration, stats *querier_stats.QueryStats, error error, statusCode int, resp *http.Response) {
 	wallTime := stats.LoadWallTime()
 	queryStorageWallTime := stats.LoadQueryStorageWallTime()
-	numSeries := stats.LoadFetchedSeries()
-	numChunks := stats.LoadFetchedChunks()
-	numSamples := stats.LoadFetchedSamples()
+	numResponseSeries := stats.LoadResponseSeries()
+	numFetchedSeries := stats.LoadFetchedSeries()
+	numFetchedChunks := stats.LoadFetchedChunks()
+	numFetchedSamples := stats.LoadFetchedSamples()
 	numScannedSamples := stats.LoadScannedSamples()
 	numPeakSamples := stats.LoadPeakSamples()
 	numChunkBytes := stats.LoadFetchedChunkBytes()
@@ -353,8 +354,8 @@ func (f *Handler) reportQueryStats(r *http.Request, userID string, queryString u
 
 	// Track stats.
 	f.querySeconds.WithLabelValues(userID).Add(wallTime.Seconds())
-	f.querySeries.WithLabelValues(userID).Add(float64(numSeries))
-	f.queryFetchedSamples.WithLabelValues(userID).Add(float64(numSamples))
+	f.queryFetchedSeries.WithLabelValues(userID).Add(float64(numFetchedSeries))
+	f.queryFetchedSamples.WithLabelValues(userID).Add(float64(numFetchedSamples))
 	f.queryScannedSamples.WithLabelValues(userID).Add(float64(numScannedSamples))
 	f.queryPeakSamples.WithLabelValues(userID).Observe(float64(numPeakSamples))
 	f.queryChunkBytes.WithLabelValues(userID).Add(float64(numChunkBytes))
@@ -378,9 +379,10 @@ func (f *Handler) reportQueryStats(r *http.Request, userID string, queryString u
 		"path", r.URL.Path,
 		"response_time", queryResponseTime,
 		"query_wall_time_seconds", wallTime.Seconds(),
-		"fetched_series_count", numSeries,
-		"fetched_chunks_count", numChunks,
-		"fetched_samples_count", numSamples,
+		"response_series_count", numResponseSeries,
+		"fetched_series_count", numFetchedSeries,
+		"fetched_chunks_count", numFetchedChunks,
+		"fetched_samples_count", numFetchedSamples,
 		"fetched_chunks_bytes", numChunkBytes,
 		"fetched_data_bytes", numDataBytes,
 		"split_queries", splitQueries,

pkg/frontend/transport/handler_test.go

@@ -429,14 +429,15 @@ func TestReportQueryStatsFormat(t *testing.T) {
 
 	tests := map[string]testCase{
 		"should not include query and header details if empty": {
-			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000`,
+			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000`,
 		},
 		"should include query length and string at the end": {
 			queryString: url.Values(map[string][]string{"query": {"up"}}),
-			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 query_length=2 param_query=up`,
+			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 query_length=2 param_query=up`,
 		},
 		"should include query stats": {
 			queryStats: &querier_stats.QueryStats{
+				QueryResponseSeries: 100,
 				Stats: querier_stats.Stats{
 					WallTime:             3 * time.Second,
 					QueryStorageWallTime: 100 * time.Minute,
@@ -448,34 +449,35 @@ func TestReportQueryStatsFormat(t *testing.T) {
 					SplitQueries:         10,
 				},
 			},
-			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=3 fetched_series_count=100 fetched_chunks_count=200 fetched_samples_count=300 fetched_chunks_bytes=1024 fetched_data_bytes=2048 split_queries=10 status_code=200 response_size=1000 query_storage_wall_time_seconds=6000`,
+			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=3 response_series_count=100 fetched_series_count=100 fetched_chunks_count=200 fetched_samples_count=300 fetched_chunks_bytes=1024 fetched_data_bytes=2048 split_queries=10 status_code=200 response_size=1000 query_storage_wall_time_seconds=6000`,
 		},
 		"should include user agent": {
 			header:      http.Header{"User-Agent": []string{"Grafana"}},
-			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 user_agent=Grafana`,
+			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 user_agent=Grafana`,
 		},
 		"should include response error": {
 			responseErr: errors.New("foo_err"),
-			expectedLog: `level=error msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 error=foo_err`,
+			expectedLog: `level=error msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 error=foo_err`,
 		},
 		"should include query priority": {
 			queryString: url.Values(map[string][]string{"query": {"up"}}),
 			queryStats: &querier_stats.QueryStats{
 				Priority:         99,
 				PriorityAssigned: true,
 			},
-			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 query_length=2 priority=99 param_query=up`,
+			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 query_length=2 priority=99 param_query=up`,
 		},
 		"should include data fetch min and max time": {
 			queryString: url.Values(map[string][]string{"query": {"up"}}),
 			queryStats: &querier_stats.QueryStats{
 				DataSelectMaxTime: 1704153600000,
 				DataSelectMinTime: 1704067200000,
 			},
-			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 data_select_max_time=1704153600 data_select_min_time=1704067200 query_length=2 param_query=up`,
+			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=0 response_series_count=0 fetched_series_count=0 fetched_chunks_count=0 fetched_samples_count=0 fetched_chunks_bytes=0 fetched_data_bytes=0 split_queries=0 status_code=200 response_size=1000 data_select_max_time=1704153600 data_select_min_time=1704067200 query_length=2 param_query=up`,
 		},
 		"should include query stats with store gateway stats": {
 			queryStats: &querier_stats.QueryStats{
+				QueryResponseSeries: 100,
 				Stats: querier_stats.Stats{
 					WallTime:                         3 * time.Second,
 					QueryStorageWallTime:             100 * time.Minute,
@@ -489,7 +491,7 @@ func TestReportQueryStatsFormat(t *testing.T) {
 					StoreGatewayTouchedPostingBytes:  200,
 				},
 			},
-			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=3 fetched_series_count=100 fetched_chunks_count=200 fetched_samples_count=300 fetched_chunks_bytes=1024 fetched_data_bytes=2048 split_queries=10 status_code=200 response_size=1000 store_gateway_touched_postings_count=20 store_gateway_touched_posting_bytes=200 query_storage_wall_time_seconds=6000`,
+			expectedLog: `level=info msg="query stats" component=query-frontend method=GET path=/prometheus/api/v1/query response_time=1s query_wall_time_seconds=3 response_series_count=100 fetched_series_count=100 fetched_chunks_count=200 fetched_samples_count=300 fetched_chunks_bytes=1024 fetched_data_bytes=2048 split_queries=10 status_code=200 response_size=1000 store_gateway_touched_postings_count=20 store_gateway_touched_posting_bytes=200 query_storage_wall_time_seconds=6000`,
 		},
 	}
 

pkg/querier/stats/stats.go

@@ -16,11 +16,12 @@ var ctxKey = contextKey(0)
 
 type QueryStats struct {
 	Stats
-	PriorityAssigned  bool
-	Priority          int64
-	DataSelectMaxTime int64
-	DataSelectMinTime int64
-	m                 sync.Mutex
+	QueryResponseSeries uint64
+	PriorityAssigned    bool
+	Priority            int64
+	DataSelectMaxTime   int64
+	DataSelectMinTime   int64
+	m                   sync.Mutex
 }
 
 // ContextWithEmptyStats returns a context with empty stats.
@@ -65,6 +66,22 @@ func (s *QueryStats) LoadWallTime() time.Duration {
 	return time.Duration(atomic.LoadInt64((*int64)(&s.WallTime)))
 }
 
+func (s *QueryStats) AddResponseSeries(series uint64) {
+	if s == nil {
+		return
+	}
+
+	atomic.AddUint64(&s.QueryResponseSeries, series)
+}
+
+func (s *QueryStats) LoadResponseSeries() uint64 {
+	if s == nil {
+		return 0
+	}
+
+	return atomic.LoadUint64(&s.QueryResponseSeries)
+}
+
 func (s *QueryStats) AddFetchedSeries(series uint64) {
 	if s == nil {
 		return

pkg/querier/tripperware/instantquery/instant_query.go

@@ -17,6 +17,7 @@ import (
 	"github.com/weaveworks/common/httpgrpc"
 	"google.golang.org/grpc/status"
 
+	"github.com/cortexproject/cortex/pkg/querier/stats"
 	"github.com/cortexproject/cortex/pkg/querier/tripperware"
 	"github.com/cortexproject/cortex/pkg/util"
 	"github.com/cortexproject/cortex/pkg/util/spanlogger"
@@ -176,6 +177,9 @@ func (instantQueryCodec) EncodeResponse(ctx context.Context, res tripperware.Res
 		return nil, httpgrpc.Errorf(http.StatusInternalServerError, "invalid response format")
 	}
 
+	queryStats := stats.FromContext(ctx)
+	tripperware.SetQueryResponseStats(a, queryStats)
+
 	b, err := json.Marshal(a)
 	if err != nil {
 		return nil, httpgrpc.Errorf(http.StatusInternalServerError, "error encoding response: %v", err)

pkg/querier/tripperware/queryrange/query_range.go

@@ -18,6 +18,7 @@ import (
 	"github.com/prometheus/common/model"
 	"github.com/weaveworks/common/httpgrpc"
 
+	"github.com/cortexproject/cortex/pkg/querier/stats"
 	"github.com/cortexproject/cortex/pkg/querier/tripperware"
 	"github.com/cortexproject/cortex/pkg/util"
 	"github.com/cortexproject/cortex/pkg/util/spanlogger"
@@ -241,6 +242,9 @@ func (prometheusCodec) EncodeResponse(ctx context.Context, res tripperware.Respo
 	if a != nil {
 		m := a.Data.Result.GetMatrix()
 		sp.LogFields(otlog.Int("series", len(m.GetSampleStreams())))
+
+		queryStats := stats.FromContext(ctx)
+		tripperware.SetQueryResponseStats(a, queryStats)
 	}
 
 	b, err := json.Marshal(a)

pkg/querier/tripperware/util.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/weaveworks/common/httpgrpc"
 
+	"github.com/cortexproject/cortex/pkg/querier/stats"
 	"github.com/cortexproject/cortex/pkg/tenant"
 	"github.com/cortexproject/cortex/pkg/util/validation"
 )
@@ -70,3 +71,19 @@ func DoRequests(ctx context.Context, downstream Handler, reqs []Request, limits
 
 	return resps, firstErr
 }
+
+func SetQueryResponseStats(a *PrometheusResponse, queryStats *stats.QueryStats) {
+	if queryStats != nil {
+		v := a.Data.Result.GetVector()
+		if v != nil {
+			queryStats.AddResponseSeries(uint64(len(v.GetSamples())))
+			return
+		}
+
+		m := a.Data.Result.GetMatrix()
+		if m != nil {
+			queryStats.AddResponseSeries(uint64(len(m.GetSampleStreams())))
+			return
+		}
+	}
+}