Add type and unit labels to prw2

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## master / unreleased
 
 * [FEATURE] StoreGateway: Introduces a new parquet mode. #7046
+* [FEATURE] Distributor: Add a per-tenant flag `-distributor.enable-type-and-unit-labels` which enables to add `__unit__` and `__type__` labels for remote write v2 and OTLP requests. The `-distributor.otlp.enable-type-and-unit-labels` flag has been consolidated into this flag. #7077
 * [ENHANCEMENT] Alertmanager: Upgrade alertmanger to 0.29.0 and add a new incidentIO integration. #7092
 * [ENHANCEMENT] Ingester: Add `enable_matcher_optimization` config to apply low selectivity matchers lazily. #7063
 * [ENHANCEMENT] Distributor: Add a label references validation for remote write v2 request. #7074

docs/configuration/config-file-reference.md

@@ -3274,11 +3274,6 @@ otlp:
   # EXPERIMENTAL: If true, delta temporality otlp metrics to be ingested.
   # CLI flag: -distributor.otlp.allow-delta-temporality
   [allow_delta_temporality: <boolean> | default = false]
-
-  # EXPERIMENTAL: If true, the '__type__' and '__unit__' labels are added for
-  # the OTLP metrics.
-  # CLI flag: -distributor.otlp.enable-type-and-unit-labels
-  [enable_type_and_unit_labels: <boolean> | default = false]
 ```
 
 ### `etcd_config`
@@ -3998,6 +3993,11 @@ The `limits_config` configures default and per-tenant limits imposed by Cortex s
 # CLI flag: -distributor.promote-resource-attributes
 [promote_resource_attributes: <list of string> | default = ]
 
+# EXPERIMENTAL: If true, the __type__ and __unit__ labels are added to metrics.
+# This applies to remote write v2 and OTLP requests.
+# CLI flag: -distributor.enable-type-and-unit-labels
+[enable_type_and_unit_labels: <boolean> | default = false]
+
 # The maximum number of active series per user, per ingester. 0 to disable.
 # CLI flag: -ingester.max-series-per-user
 [max_series_per_user: <int> | default = 5000000]

go.mod

@@ -50,7 +50,7 @@ require (
 	github.com/spf13/afero v1.11.0
 	github.com/stretchr/testify v1.11.1
 	github.com/thanos-io/objstore v0.0.0-20250722142242-922b22272ee3
-	github.com/thanos-io/promql-engine v0.0.0-20250924193140-e9123dc11264
+	github.com/thanos-io/promql-engine v0.0.0-20251117105526-bcec363c24e6
 	github.com/thanos-io/thanos v0.39.3-0.20250729120336-88d0ae8071cb
 	github.com/uber/jaeger-client-go v2.30.0+incompatible
 	github.com/weaveworks/common v0.0.0-20230728070032-dd9e68f319d5

go.sum

@@ -1774,8 +1774,8 @@ github.com/thanos-community/galaxycache v0.0.0-20211122094458-3a32041a1f1e h1:f1
 github.com/thanos-community/galaxycache v0.0.0-20211122094458-3a32041a1f1e/go.mod h1:jXcofnrSln/cLI6/dhlBxPQZEEQHVPCcFaH75M+nSzM=
 github.com/thanos-io/objstore v0.0.0-20250722142242-922b22272ee3 h1:P301Anc27aVL7Ls88el92j+qW3PJp8zmiDl+kOUZv3A=
 github.com/thanos-io/objstore v0.0.0-20250722142242-922b22272ee3/go.mod h1:uDHLkMKOGDAnlN75EAz8VrRzob1+VbgYSuUleatWuF0=
-github.com/thanos-io/promql-engine v0.0.0-20250924193140-e9123dc11264 h1:sOmANo4XVhem4VgvI9w05DBwqMex/qw+cDjuHW2FKWw=
-github.com/thanos-io/promql-engine v0.0.0-20250924193140-e9123dc11264/go.mod h1:MOFN0M1nDMcWZg1t4iF39sOard/K4SWgO/HHSODeDIc=
+github.com/thanos-io/promql-engine v0.0.0-20251117105526-bcec363c24e6 h1:/8TlVay3hF8LQ7iGLRm9aNRGQsyYOXFPNmtg5dsNwcM=
+github.com/thanos-io/promql-engine v0.0.0-20251117105526-bcec363c24e6/go.mod h1:MOFN0M1nDMcWZg1t4iF39sOard/K4SWgO/HHSODeDIc=
 github.com/thanos-io/thanos v0.39.3-0.20250729120336-88d0ae8071cb h1:z/ePbn3lo/D4vdHGH8hpa2kgH9M6iLq0kOFtZwuelKM=
 github.com/thanos-io/thanos v0.39.3-0.20250729120336-88d0ae8071cb/go.mod h1:gGUG3TDEoRSjTFVs/QO6QnQIILRgNF0P9l7BiiMfmHw=
 github.com/tinylib/msgp v1.3.0 h1:ULuf7GPooDaIlbyvgAxBV/FI7ynli6LZ1/nVUNu+0ww=

integration/e2e/util.go

@@ -465,18 +465,20 @@ func GenerateSeriesV2(name string, ts time.Time, additionalLabels ...prompb.Labe
 	st := writev2.NewSymbolTable()
 	lb := labels.NewScratchBuilder(0)
 	lb.Add("__name__", name)
-
 	for _, label := range additionalLabels {
 		lb.Add(label.Name, label.Value)
 	}
+
 	series = append(series, writev2.TimeSeries{
 		// Generate the series
 		LabelsRefs: st.SymbolizeLabels(lb.Labels(), nil),
 		Samples: []writev2.Sample{
 			{Value: value, Timestamp: tsMillis},
 		},
 		Metadata: writev2.Metadata{
-			Type: writev2.Metadata_METRIC_TYPE_GAUGE,
+			Type:    writev2.Metadata_METRIC_TYPE_GAUGE,
+			HelpRef: 2, // equal to name
+			UnitRef: 2, // equal to name
 		},
 	})
 	symbols = st.Symbols()

integration/otlp_test.go

@@ -281,7 +281,7 @@ func TestOTLPEnableTypeAndUnitLabels(t *testing.T) {
 		"-auth.enabled": "true",
 
 		// OTLP
-		"-distributor.otlp.enable-type-and-unit-labels": "true",
+		"-distributor.enable-type-and-unit-labels": "true",
 
 		// alert manager
 		"-alertmanager.web.external-url":   "http://localhost/alertmanager",

integration/remote_write_v2_test.go

@@ -204,6 +204,77 @@ func TestIngest_SenderSendPRW2_DistributorNotAllowPRW2(t *testing.T) {
 	require.Empty(t, result)
 }
 
+func TestIngest_EnableTypeAndUnitLabels(t *testing.T) {
+	const blockRangePeriod = 5 * time.Second
+
+	s, err := e2e.NewScenario(networkName)
+	require.NoError(t, err)
+	defer s.Close()
+
+	// Start dependencies.
+	consul := e2edb.NewConsulWithName("consul")
+	require.NoError(t, s.StartAndWaitReady(consul))
+
+	flags := mergeFlags(
+		AlertmanagerLocalFlags(),
+		map[string]string{
+			"-store.engine":                                     blocksStorageEngine,
+			"-blocks-storage.backend":                           "filesystem",
+			"-blocks-storage.tsdb.head-compaction-interval":     "4m",
+			"-blocks-storage.bucket-store.sync-interval":        "15m",
+			"-blocks-storage.bucket-store.index-cache.backend":  tsdb.IndexCacheBackendInMemory,
+			"-blocks-storage.bucket-store.bucket-index.enabled": "true",
+			"-querier.query-store-for-labels-enabled":           "true",
+			"-blocks-storage.tsdb.block-ranges-period":          blockRangePeriod.String(),
+			"-blocks-storage.tsdb.ship-interval":                "1s",
+			"-blocks-storage.tsdb.retention-period":             ((blockRangePeriod * 2) - 1).String(),
+			"-blocks-storage.tsdb.enable-native-histograms":     "true",
+			// Ingester.
+			"-ring.store":      "consul",
+			"-consul.hostname": consul.NetworkHTTPEndpoint(),
+			// Distributor.
+			"-distributor.replication-factor":          "1",
+			"-distributor.remote-writev2-enabled":      "true",
+			"-distributor.enable-type-and-unit-labels": "true",
+			// Store-gateway.
+			"-store-gateway.sharding-enabled": "false",
+			// alert manager
+			"-alertmanager.web.external-url": "http://localhost/alertmanager",
+		},
+	)
+
+	// make alert manager config dir
+	require.NoError(t, writeFileToSharedDir(s, "alertmanager_configs", []byte{}))
+
+	path := path.Join(s.SharedDir(), "cortex-1")
+
+	flags = mergeFlags(flags, map[string]string{"-blocks-storage.filesystem.dir": path})
+	// Start Cortex replicas.
+	cortex := e2ecortex.NewSingleBinary("cortex", flags, "")
+	require.NoError(t, s.StartAndWaitReady(cortex))
+
+	// Wait until Cortex replicas have updated the ring state.
+	require.NoError(t, cortex.WaitSumMetrics(e2e.Equals(float64(512)), "cortex_ring_tokens_total"))
+
+	c, err := e2ecortex.NewClient(cortex.HTTPEndpoint(), cortex.HTTPEndpoint(), "", "", "user-1")
+	require.NoError(t, err)
+
+	now := time.Now()
+
+	// series push
+	symbols1, series, _ := e2e.GenerateSeriesV2("test_series", now, prompb.Label{Name: "job", Value: "test"}, prompb.Label{Name: "foo", Value: "bar"})
+	writeStats, err := c.PushV2(symbols1, series)
+	require.NoError(t, err)
+	testPushHeader(t, writeStats, 1, 0, 0)
+
+	value, err := c.Query("test_series", now)
+	require.NoError(t, err)
+	require.Equal(t, model.ValVector, value.Type())
+	vec := value.(model.Vector)
+	require.True(t, vec[0].Metric["__unit__"] != "")
+	require.True(t, vec[0].Metric["__type__"] != "")
+}
+
 func TestIngest(t *testing.T) {
 	const blockRangePeriod = 5 * time.Second
 

pkg/api/api.go

@@ -283,7 +283,7 @@ func (a *API) RegisterRuntimeConfig(runtimeConfigHandler http.HandlerFunc) {
 func (a *API) RegisterDistributor(d *distributor.Distributor, pushConfig distributor.Config, overrides *validation.Overrides) {
 	distributorpb.RegisterDistributorServer(a.server.GRPC, d)
 
-	a.RegisterRoute("/api/v1/push", push.Handler(pushConfig.RemoteWriteV2Enabled, pushConfig.MaxRecvMsgSize, a.sourceIPs, a.cfg.wrapDistributorPush(d)), true, "POST")
+	a.RegisterRoute("/api/v1/push", push.Handler(pushConfig.RemoteWriteV2Enabled, pushConfig.MaxRecvMsgSize, overrides, a.sourceIPs, a.cfg.wrapDistributorPush(d)), true, "POST")
 	a.RegisterRoute("/api/v1/otlp/v1/metrics", push.OTLPHandler(pushConfig.OTLPMaxRecvMsgSize, overrides, pushConfig.OTLPConfig, a.sourceIPs, a.cfg.wrapDistributorPush(d)), true, "POST")
 
 	a.indexPage.AddLink(SectionAdminEndpoints, "/distributor/ring", "Distributor Ring Status")
@@ -295,7 +295,7 @@ func (a *API) RegisterDistributor(d *distributor.Distributor, pushConfig distrib
 	a.RegisterRoute("/distributor/ha_tracker", d.HATracker, false, "GET")
 
 	// Legacy Routes
-	a.RegisterRoute(path.Join(a.cfg.LegacyHTTPPrefix, "/push"), push.Handler(pushConfig.RemoteWriteV2Enabled, pushConfig.MaxRecvMsgSize, a.sourceIPs, a.cfg.wrapDistributorPush(d)), true, "POST")
+	a.RegisterRoute(path.Join(a.cfg.LegacyHTTPPrefix, "/push"), push.Handler(pushConfig.RemoteWriteV2Enabled, pushConfig.MaxRecvMsgSize, overrides, a.sourceIPs, a.cfg.wrapDistributorPush(d)), true, "POST")
 	a.RegisterRoute("/all_user_stats", http.HandlerFunc(d.AllUserStatsHandler), false, "GET")
 	a.RegisterRoute("/ha-tracker", d.HATracker, false, "GET")
 }
@@ -313,7 +313,7 @@ type Ingester interface {
 }
 
 // RegisterIngester registers the ingesters HTTP and GRPC service
-func (a *API) RegisterIngester(i Ingester, pushConfig distributor.Config) {
+func (a *API) RegisterIngester(i Ingester, pushConfig distributor.Config, overrides *validation.Overrides) {
 	client.RegisterIngesterServer(a.server.GRPC, i)
 
 	a.indexPage.AddLink(SectionAdminEndpoints, "/ingester/all_user_stats", "Usage Statistics")
@@ -328,12 +328,12 @@ func (a *API) RegisterIngester(i Ingester, pushConfig distributor.Config) {
 	a.RegisterRoute("/ingester/renewTokens", http.HandlerFunc(i.RenewTokenHandler), false, "GET", "POST")
 	a.RegisterRoute("/ingester/all_user_stats", http.HandlerFunc(i.AllUserStatsHandler), false, "GET")
 	a.RegisterRoute("/ingester/mode", http.HandlerFunc(i.ModeHandler), false, "GET", "POST")
-	a.RegisterRoute("/ingester/push", push.Handler(pushConfig.RemoteWriteV2Enabled, pushConfig.MaxRecvMsgSize, a.sourceIPs, i.Push), true, "POST") // For testing and debugging.
+	a.RegisterRoute("/ingester/push", push.Handler(pushConfig.RemoteWriteV2Enabled, pushConfig.MaxRecvMsgSize, overrides, a.sourceIPs, i.Push), true, "POST") // For testing and debugging.
 
 	// Legacy Routes
 	a.RegisterRoute("/flush", http.HandlerFunc(i.FlushHandler), false, "GET", "POST")
 	a.RegisterRoute("/shutdown", http.HandlerFunc(i.ShutdownHandler), false, "GET", "POST")
-	a.RegisterRoute("/push", push.Handler(pushConfig.RemoteWriteV2Enabled, pushConfig.MaxRecvMsgSize, a.sourceIPs, i.Push), true, "POST") // For testing and debugging.
+	a.RegisterRoute("/push", push.Handler(pushConfig.RemoteWriteV2Enabled, pushConfig.MaxRecvMsgSize, overrides, a.sourceIPs, i.Push), true, "POST") // For testing and debugging.
 }
 
 func (a *API) RegisterTenantDeletion(api *purger.TenantDeletionAPI) {

pkg/cortex/modules.go

@@ -492,7 +492,7 @@ func (t *Cortex) initIngesterService() (serv services.Service, err error) {
 }
 
 func (t *Cortex) initIngester() (serv services.Service, err error) {
-	t.API.RegisterIngester(t.Ingester, t.Cfg.Distributor)
+	t.API.RegisterIngester(t.Ingester, t.Cfg.Distributor, t.Overrides)
 
 	return nil, nil
 }

pkg/cortexpb/compatv2.go

@@ -3,6 +3,7 @@ package cortexpb
 import (
 	"fmt"
 
+	"github.com/prometheus/common/model"
 	"github.com/prometheus/prometheus/model/labels"
 )
 
@@ -32,3 +33,26 @@ func desymbolizeLabels(b *labels.ScratchBuilder, labelRefs []uint32, symbols []s
 	b.Sort()
 	return b.Labels(), nil
 }
+
+func MetadataV2MetricTypeToMetricType(mt MetadataV2_MetricType) model.MetricType {
+	switch mt {
+	case METRIC_TYPE_UNSPECIFIED:
+		return model.MetricTypeUnknown
+	case METRIC_TYPE_COUNTER:
+		return model.MetricTypeCounter
+	case METRIC_TYPE_GAUGE:
+		return model.MetricTypeGauge
+	case METRIC_TYPE_HISTOGRAM:
+		return model.MetricTypeHistogram
+	case METRIC_TYPE_GAUGEHISTOGRAM:
+		return model.MetricTypeGaugeHistogram
+	case METRIC_TYPE_SUMMARY:
+		return model.MetricTypeSummary
+	case METRIC_TYPE_INFO:
+		return model.MetricTypeInfo
+	case METRIC_TYPE_STATESET:
+		return model.MetricTypeStateset
+	default:
+		return model.MetricTypeUnknown
+	}
+}

pkg/distributor/distributor.go

@@ -197,10 +197,9 @@ type InstanceLimits struct {
 }
 
 type OTLPConfig struct {
-	ConvertAllAttributes    bool `yaml:"convert_all_attributes"`
-	DisableTargetInfo       bool `yaml:"disable_target_info"`
-	AllowDeltaTemporality   bool `yaml:"allow_delta_temporality"`
-	EnableTypeAndUnitLabels bool `yaml:"enable_type_and_unit_labels"`
+	ConvertAllAttributes  bool `yaml:"convert_all_attributes"`
+	DisableTargetInfo     bool `yaml:"disable_target_info"`
+	AllowDeltaTemporality bool `yaml:"allow_delta_temporality"`
 }
 
 // RegisterFlags adds the flags required to config this to the given FlagSet
@@ -229,7 +228,6 @@ func (cfg *Config) RegisterFlags(f *flag.FlagSet) {
 	f.BoolVar(&cfg.OTLPConfig.ConvertAllAttributes, "distributor.otlp.convert-all-attributes", false, "If true, all resource attributes are converted to labels.")
 	f.BoolVar(&cfg.OTLPConfig.DisableTargetInfo, "distributor.otlp.disable-target-info", false, "If true, a target_info metric is not ingested. (refer to: https://github.com/prometheus/OpenMetrics/blob/main/specification/OpenMetrics.md#supporting-target-metadata-in-both-push-based-and-pull-based-systems)")
 	f.BoolVar(&cfg.OTLPConfig.AllowDeltaTemporality, "distributor.otlp.allow-delta-temporality", false, "EXPERIMENTAL: If true, delta temporality otlp metrics to be ingested.")
-	f.BoolVar(&cfg.OTLPConfig.EnableTypeAndUnitLabels, "distributor.otlp.enable-type-and-unit-labels", false, "EXPERIMENTAL: If true, the '__type__' and '__unit__' labels are added for the OTLP metrics.")
 }
 
 // Validate config and returns error on failure

pkg/util/push/otlp.go

@@ -181,7 +181,7 @@ func convertToPromTS(ctx context.Context, pmetrics pmetric.Metrics, cfg distribu
 		AddMetricSuffixes:       true,
 		DisableTargetInfo:       cfg.DisableTargetInfo,
 		AllowDeltaTemporality:   cfg.AllowDeltaTemporality,
-		EnableTypeAndUnitLabels: cfg.EnableTypeAndUnitLabels,
+		EnableTypeAndUnitLabels: overrides.EnableTypeAndUnitLabels(userID),
 	}
 
 	var annots annotations.Annotations

pkg/util/push/otlp_test.go

@@ -80,8 +80,7 @@ func TestOTLP_EnableTypeAndUnitLabels(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.description, func(t *testing.T) {
 			cfg := distributor.OTLPConfig{
-				EnableTypeAndUnitLabels: test.enableTypeAndUnitLabels,
-				AllowDeltaTemporality:   test.allowDeltaTemporality,
+				AllowDeltaTemporality: test.allowDeltaTemporality,
 			}
 			metrics := pmetric.NewMetrics()
 			rm := metrics.ResourceMetrics().AppendEmpty()
@@ -90,6 +89,7 @@ func TestOTLP_EnableTypeAndUnitLabels(t *testing.T) {
 			test.otlpSeries.CopyTo(sm.Metrics().AppendEmpty())
 
 			limits := validation.Limits{}
+			limits.EnableTypeAndUnitLabels = test.enableTypeAndUnitLabels
 			overrides := validation.NewOverrides(limits, nil)
 			promSeries, metadata, err := convertToPromTS(ctx, metrics, cfg, overrides, "user-1", logger)
 			require.NoError(t, err)

pkg/util/push/push.go

@@ -9,14 +9,17 @@ import (
 	"github.com/go-kit/log/level"
 	"github.com/prometheus/client_golang/exp/api/remote"
 	"github.com/prometheus/prometheus/model/labels"
+	"github.com/prometheus/prometheus/schema"
 	"github.com/prometheus/prometheus/util/compression"
 	"github.com/weaveworks/common/httpgrpc"
 	"github.com/weaveworks/common/middleware"
 
 	"github.com/cortexproject/cortex/pkg/cortexpb"
+	"github.com/cortexproject/cortex/pkg/tenant"
 	"github.com/cortexproject/cortex/pkg/util"
 	"github.com/cortexproject/cortex/pkg/util/extract"
 	"github.com/cortexproject/cortex/pkg/util/log"
+	"github.com/cortexproject/cortex/pkg/util/validation"
 )
 
 const (
@@ -36,7 +39,7 @@ const (
 type Func func(context.Context, *cortexpb.WriteRequest) (*cortexpb.WriteResponse, error)
 
 // Handler is a http.Handler which accepts WriteRequests.
-func Handler(remoteWrite2Enabled bool, maxRecvMsgSize int, sourceIPs *middleware.SourceIPExtractor, push Func) http.Handler {
+func Handler(remoteWrite2Enabled bool, maxRecvMsgSize int, overrides *validation.Overrides, sourceIPs *middleware.SourceIPExtractor, push Func) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		ctx := r.Context()
 		logger := log.WithContext(ctx, log.Logger)
@@ -78,8 +81,13 @@ func Handler(remoteWrite2Enabled bool, maxRecvMsgSize int, sourceIPs *middleware
 		}
 
 		handlePRW2 := func() {
+			userID, err := tenant.TenantID(ctx)
+			if err != nil {
+				return
+			}
+
 			var req cortexpb.PreallocWriteRequestV2
-			err := util.ParseProtoReader(ctx, r.Body, int(r.ContentLength), maxRecvMsgSize, &req, util.RawSnappy)
+			err = util.ParseProtoReader(ctx, r.Body, int(r.ContentLength), maxRecvMsgSize, &req, util.RawSnappy)
 			if err != nil {
 				level.Error(logger).Log("err", err.Error())
 				http.Error(w, err.Error(), http.StatusBadRequest)
@@ -91,7 +99,7 @@ func Handler(remoteWrite2Enabled bool, maxRecvMsgSize int, sourceIPs *middleware
 				req.Source = cortexpb.API
 			}
 
-			v1Req, err := convertV2RequestToV1(&req)
+			v1Req, err := convertV2RequestToV1(&req, overrides.EnableTypeAndUnitLabels(userID))
 			if err != nil {
 				level.Error(logger).Log("err", err.Error())
 				http.Error(w, err.Error(), http.StatusBadRequest)
@@ -169,7 +177,7 @@ func setPRW2RespHeader(w http.ResponseWriter, samples, histograms, exemplars int
 	w.Header().Set(rw20WrittenExemplarsHeader, strconv.FormatInt(exemplars, 10))
 }
 
-func convertV2RequestToV1(req *cortexpb.PreallocWriteRequestV2) (cortexpb.PreallocWriteRequest, error) {
+func convertV2RequestToV1(req *cortexpb.PreallocWriteRequestV2, enableTypeAndUnitLabels bool) (cortexpb.PreallocWriteRequest, error) {
 	var v1Req cortexpb.PreallocWriteRequest
 	v1Timeseries := make([]cortexpb.PreallocTimeseries, 0, len(req.Timeseries))
 	var v1Metadata []*cortexpb.MetricMetadata
@@ -181,10 +189,25 @@ func convertV2RequestToV1(req *cortexpb.PreallocWriteRequestV2) (cortexpb.Preall
 		if err != nil {
 			return v1Req, err
 		}
+
+		unit := symbols[v2Ts.Metadata.UnitRef]
+		metricType := v2Ts.Metadata.Type
+		shouldAttachTypeAndUnitLabels := enableTypeAndUnitLabels && (metricType != cortexpb.METRIC_TYPE_UNSPECIFIED || unit != "")
+		if shouldAttachTypeAndUnitLabels {
+			slb := labels.NewScratchBuilder(lbs.Len() + 2) // for __type__ and __unit__
+			lbs.Range(func(l labels.Label) {
+				slb.Add(l.Name, l.Value)
+			})
+			schema.Metadata{Type: cortexpb.MetadataV2MetricTypeToMetricType(metricType), Unit: unit}.AddToLabels(&slb)
+			slb.Sort()
+			lbs = slb.Labels()
+		}
+
 		exemplars, err := convertV2ToV1Exemplars(&b, symbols, v2Ts.Exemplars)
 		if err != nil {
 			return v1Req, err
 		}
+
 		v1Timeseries = append(v1Timeseries, cortexpb.PreallocTimeseries{
 			TimeSeries: &cortexpb.TimeSeries{
 				Labels:     cortexpb.FromLabelsToLabelAdapters(lbs),