Add E2E latency metrics

assets/docs/configuration/metrics/e2e-latency-example.hcl

@@ -0,0 +1,4 @@
+metrics {
+  # Optional toggle for E2E latency (difference between Snowplow collector timestamp and target write timestamp)
+  enable_e2e_latency = true
+}

assets/docs/configuration/overview-full-example.hcl

@@ -108,6 +108,11 @@ retry {
   }
 }
 
+metrics {
+  # Optional toggle for E2E latency (difference between Snowplow collector timestamp and target write timestamp)
+  enable_e2e_latency = true
+}
+
 license {
   accept = true
 }

assets/test/transformconfig/TestEnginesAndTransformations/configs/transform-collector-tstamp.hcl

@@ -0,0 +1,3 @@
+metrics {
+  enable_e2e_latency = true
+}

config/config.go

@@ -56,6 +56,7 @@ type configurationData struct {
 	DisableTelemetry bool           `hcl:"disable_telemetry,optional"`
 	License          *licenseConfig `hcl:"license,block"`
 	Retry            *retryConfig   `hcl:"retry,block"`
+	Metrics          *metricsConfig `hcl:"metrics,block"`
 }
 
 // component is a type to abstract over configuration blocks.
@@ -100,6 +101,10 @@ type retryConfig struct {
 	Setup     *setupRetryConfig     `hcl:"setup,block"`
 }
 
+type metricsConfig struct {
+	E2ELatencyEnabled bool `hcl:"enable_e2e_latency,optional"`
+}
+
 type transientRetryConfig struct {
 	Delay       int `hcl:"delay_ms,optional"`
 	MaxAttempts int `hcl:"max_attempts,optional"`
@@ -142,6 +147,9 @@ func defaultConfigData() *configurationData {
 				Delay: 20000,
 			},
 		},
+		Metrics: &metricsConfig{
+			E2ELatencyEnabled: false,
+		},
 	}
 }
 
@@ -359,7 +367,7 @@ func (c *Config) getStatsReceiver(tags map[string]string) (statsreceiveriface.St
 	switch useReceiver.Name {
 	case "statsd":
 		plug := statsreceiver.AdaptStatsDStatsReceiverFunc(
-			statsreceiver.NewStatsDReceiverWithTags(tags),
+			statsreceiver.NewStatsDReceiverWithTags(tags, c.Data.Metrics.E2ELatencyEnabled),
 		)
 		component, err := c.CreateComponent(plug, decoderOpts)
 		if err != nil {

docs/configuration_metrics_docs_test.go

@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) 2020-present Snowplow Analytics Ltd.
+ * All rights reserved.
+ *
+ * This software is made available by Snowplow Analytics, Ltd.,
+ * under the terms of the Snowplow Limited Use License Agreement, Version 1.0
+ * located at https://docs.snowplow.io/limited-use-license-1.0
+ * BY INSTALLING, DOWNLOADING, ACCESSING, USING OR DISTRIBUTING ANY PORTION
+ * OF THE SOFTWARE, YOU AGREE TO THE TERMS OF SUCH LICENSE AGREEMENT.
+ */
+
+package docs
+
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/snowplow/snowbridge/assets"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMetricsConfigDocumentation(t *testing.T) {
+	assert := assert.New(t)
+	configPath := filepath.Join(assets.AssetsRootDir, "docs", "configuration", "metrics", "e2e-latency-example.hcl")
+	c := getConfigFromFilepath(t, configPath)
+
+	metricsConfig := c.Data.Metrics
+	assert.NotNil(metricsConfig)
+	assert.Equal(true, metricsConfig.E2ELatencyEnabled)
+}

pkg/models/message.go

@@ -22,6 +22,9 @@ type Message struct {
 	Data         []byte
 	HTTPHeaders  map[string]string
 
+	// CollectorTstamp is the timestamp created by the Snowplow collector, extracted from the `collector_tstamp` atomic field. Used to measure E2E latency
+	CollectorTstamp time.Time
+
 	// TimeCreated is when the message was created originally
 	TimeCreated time.Time
 

pkg/models/observer_buffer.go

@@ -52,6 +52,9 @@ type ObserverBuffer struct {
 	MaxRequestLatency   time.Duration
 	MinRequestLatency   time.Duration
 	SumRequestLatency   time.Duration
+	MaxE2ELatency       time.Duration
+	MinE2ELatency       time.Duration
+	SumE2ELatency       time.Duration
 }
 
 // AppendWrite adds a normal TargetWriteResult onto the buffer and stores the result
@@ -128,6 +131,14 @@ func (b *ObserverBuffer) appendWriteResult(res *TargetWriteResult) {
 		b.MinRequestLatency = res.MinRequestLatency
 	}
 	b.SumRequestLatency += res.AvgRequestLatency
+
+	if b.MaxE2ELatency < res.MaxE2ELatency {
+		b.MaxE2ELatency = res.MaxE2ELatency
+	}
+	if b.MinE2ELatency > res.MinE2ELatency || b.MinE2ELatency == time.Duration(0) {
+		b.MinE2ELatency = res.MinE2ELatency
+	}
+	b.SumE2ELatency += res.AvgE2ELatency
 }
 
 // AppendFiltered adds a FilterResult onto the buffer and stores the result
@@ -180,9 +191,14 @@ func (b *ObserverBuffer) GetAvgRequestLatency() time.Duration {
 	return common.GetAverageFromDuration(b.SumRequestLatency, b.MsgTotal)
 }
 
+// GetAvgE2ELatency calculates average E2E latency
+func (b *ObserverBuffer) GetAvgE2ELatency() time.Duration {
+	return common.GetAverageFromDuration(b.SumE2ELatency, b.MsgTotal)
+}
+
 func (b *ObserverBuffer) String() string {
 	return fmt.Sprintf(
-		"TargetResults:%d,MsgFiltered:%d,MsgSent:%d,MsgFailed:%d,OversizedTargetResults:%d,OversizedMsgSent:%d,OversizedMsgFailed:%d,InvalidTargetResults:%d,InvalidMsgSent:%d,InvalidMsgFailed:%d,MaxProcLatency:%d,MaxMsgLatency:%d,MaxFilterLatency:%d,MaxTransformLatency:%d,SumTransformLatency:%d,SumProcLatency:%d,SumMsgLatency:%d,MinReqLatency:%d,MaxReqLatency:%d,SumReqLatency:%d",
+		"TargetResults:%d,MsgFiltered:%d,MsgSent:%d,MsgFailed:%d,OversizedTargetResults:%d,OversizedMsgSent:%d,OversizedMsgFailed:%d,InvalidTargetResults:%d,InvalidMsgSent:%d,InvalidMsgFailed:%d,MaxProcLatency:%d,MaxMsgLatency:%d,MaxFilterLatency:%d,MaxTransformLatency:%d,SumTransformLatency:%d,SumProcLatency:%d,SumMsgLatency:%d,MinReqLatency:%d,MaxReqLatency:%d,SumReqLatency:%d,MinE2ELatency:%d,MaxE2ELatency:%d,SumE2ELatency:%d",
 		b.TargetResults,
 		b.MsgFiltered,
 		b.MsgSent,
@@ -203,5 +219,8 @@ func (b *ObserverBuffer) String() string {
 		b.MinRequestLatency.Milliseconds(),
 		b.MaxRequestLatency.Milliseconds(),
 		b.SumRequestLatency.Milliseconds(),
+		b.MinE2ELatency.Milliseconds(),
+		b.MaxE2ELatency.Milliseconds(),
+		b.SumE2ELatency.Milliseconds(),
 	)
 }

pkg/models/observer_buffer_test.go

@@ -30,6 +30,7 @@ func TestObserverBuffer(t *testing.T) {
 		{
 			Data:                []byte("Baz"),
 			PartitionKey:        "partition1",
+			CollectorTstamp:     timeNow.Add(time.Duration(-60) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-50) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-4) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-2) * time.Minute),
@@ -39,6 +40,7 @@ func TestObserverBuffer(t *testing.T) {
 		{
 			Data:                []byte("Bar"),
 			PartitionKey:        "partition2",
+			CollectorTstamp:     timeNow.Add(time.Duration(-80) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-70) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-7) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-4) * time.Minute),
@@ -50,6 +52,7 @@ func TestObserverBuffer(t *testing.T) {
 		{
 			Data:                []byte("Foo"),
 			PartitionKey:        "partition3",
+			CollectorTstamp:     timeNow.Add(time.Duration(-40) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-30) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-10) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-9) * time.Minute),
@@ -119,7 +122,11 @@ func TestObserverBuffer(t *testing.T) {
 	assert.Equal(time.Duration(8)*time.Minute, b.MaxRequestLatency)
 	assert.Equal(time.Duration(1)*time.Minute, b.MinRequestLatency)
 
-	assert.Equal("TargetResults:2,MsgFiltered:1,MsgSent:4,MsgFailed:2,OversizedTargetResults:2,OversizedMsgSent:4,OversizedMsgFailed:2,InvalidTargetResults:2,InvalidMsgSent:4,InvalidMsgFailed:2,MaxProcLatency:600000,MaxMsgLatency:4200000,MaxFilterLatency:600000,MaxTransformLatency:180000,SumTransformLatency:720000,SumProcLatency:2520000,SumMsgLatency:18000000,MinReqLatency:60000,MaxReqLatency:480000,SumReqLatency:1320000", b.String())
+	assert.Equal(time.Duration(80)*time.Minute, b.MaxE2ELatency)
+	assert.Equal(time.Duration(40)*time.Minute, b.MinE2ELatency)
+	assert.Equal(time.Duration(60)*time.Minute, b.GetAvgE2ELatency())
+
+	assert.Equal("TargetResults:2,MsgFiltered:1,MsgSent:4,MsgFailed:2,OversizedTargetResults:2,OversizedMsgSent:4,OversizedMsgFailed:2,InvalidTargetResults:2,InvalidMsgSent:4,InvalidMsgFailed:2,MaxProcLatency:600000,MaxMsgLatency:4200000,MaxFilterLatency:600000,MaxTransformLatency:180000,SumTransformLatency:720000,SumProcLatency:2520000,SumMsgLatency:18000000,MinReqLatency:60000,MaxReqLatency:480000,SumReqLatency:1320000,MinE2ELatency:2400000,MaxE2ELatency:4800000,SumE2ELatency:21600000", b.String())
 }
 
 // TestObserverBuffer_Basic is a basic version of the above test, stripping away all but one event
@@ -191,7 +198,7 @@ func TestObserverBuffer_Basic(t *testing.T) {
 	assert.Equal(time.Duration(1)*time.Minute, b.MaxRequestLatency)
 	assert.Equal(time.Duration(1)*time.Minute, b.MinRequestLatency)
 
-	assert.Equal("TargetResults:1,MsgFiltered:0,MsgSent:1,MsgFailed:0,OversizedTargetResults:0,OversizedMsgSent:0,OversizedMsgFailed:0,InvalidTargetResults:0,InvalidMsgSent:0,InvalidMsgFailed:0,MaxProcLatency:240000,MaxMsgLatency:3000000,MaxFilterLatency:0,MaxTransformLatency:120000,SumTransformLatency:120000,SumProcLatency:240000,SumMsgLatency:3000000,MinReqLatency:60000,MaxReqLatency:60000,SumReqLatency:60000", b.String())
+	assert.Equal("TargetResults:1,MsgFiltered:0,MsgSent:1,MsgFailed:0,OversizedTargetResults:0,OversizedMsgSent:0,OversizedMsgFailed:0,InvalidTargetResults:0,InvalidMsgSent:0,InvalidMsgFailed:0,MaxProcLatency:240000,MaxMsgLatency:3000000,MaxFilterLatency:0,MaxTransformLatency:120000,SumTransformLatency:120000,SumProcLatency:240000,SumMsgLatency:3000000,MinReqLatency:60000,MaxReqLatency:60000,SumReqLatency:60000,MinE2ELatency:0,MaxE2ELatency:0,SumE2ELatency:0", b.String())
 }
 
 // TestObserverBuffer_BasicNoTransform is a basic version of the above test, stripping away all but one event.
@@ -260,5 +267,5 @@ func TestObserverBuffer_BasicNoTransform(t *testing.T) {
 	assert.Equal(time.Duration(1)*time.Minute, b.MaxRequestLatency)
 	assert.Equal(time.Duration(1)*time.Minute, b.MinRequestLatency)
 
-	assert.Equal("TargetResults:1,MsgFiltered:0,MsgSent:1,MsgFailed:0,OversizedTargetResults:0,OversizedMsgSent:0,OversizedMsgFailed:0,InvalidTargetResults:0,InvalidMsgSent:0,InvalidMsgFailed:0,MaxProcLatency:240000,MaxMsgLatency:3000000,MaxFilterLatency:0,MaxTransformLatency:0,SumTransformLatency:0,SumProcLatency:240000,SumMsgLatency:3000000,MinReqLatency:60000,MaxReqLatency:60000,SumReqLatency:60000", b.String())
+	assert.Equal("TargetResults:1,MsgFiltered:0,MsgSent:1,MsgFailed:0,OversizedTargetResults:0,OversizedMsgSent:0,OversizedMsgFailed:0,InvalidTargetResults:0,InvalidMsgSent:0,InvalidMsgFailed:0,MaxProcLatency:240000,MaxMsgLatency:3000000,MaxFilterLatency:0,MaxTransformLatency:0,SumTransformLatency:0,SumProcLatency:240000,SumMsgLatency:3000000,MinReqLatency:60000,MaxReqLatency:60000,SumReqLatency:60000,MinE2ELatency:0,MaxE2ELatency:0,SumE2ELatency:0", b.String())
 }

pkg/models/target_write_result.go

@@ -61,6 +61,10 @@ type TargetWriteResult struct {
 	MaxRequestLatency time.Duration
 	MinRequestLatency time.Duration
 	AvgRequestLatency time.Duration
+
+	MaxE2ELatency time.Duration
+	MinE2ELatency time.Duration
+	AvgE2ELatency time.Duration
 }
 
 // NewTargetWriteResult builds a result structure to return from a target write
@@ -84,6 +88,7 @@ func NewTargetWriteResult(sent []*Message, failed []*Message, oversized []*Messa
 	var sumMessageLatency time.Duration
 	var sumTransformLatency time.Duration
 	var sumRequestLatency time.Duration
+	var sumE2ELatency time.Duration
 
 	for _, msg := range processed {
 		procLatency := msg.TimeRequestFinished.Sub(msg.TimePulled)
@@ -124,13 +129,26 @@ func NewTargetWriteResult(sent []*Message, failed []*Message, oversized []*Messa
 			r.MinRequestLatency = requestLatency
 		}
 		sumRequestLatency += requestLatency
+
+		var e2eLatency time.Duration
+		if !msg.CollectorTstamp.IsZero() {
+			e2eLatency = msg.TimeRequestFinished.Sub(msg.CollectorTstamp)
+		}
+		if r.MaxE2ELatency < e2eLatency {
+			r.MaxE2ELatency = e2eLatency
+		}
+		if r.MinE2ELatency > e2eLatency || r.MinE2ELatency == time.Duration(0) {
+			r.MinE2ELatency = e2eLatency
+		}
+		sumE2ELatency += e2eLatency
 	}
 
 	if processedLen > 0 {
 		r.AvgProcLatency = common.GetAverageFromDuration(sumProcLatency, processedLen)
 		r.AvgMsgLatency = common.GetAverageFromDuration(sumMessageLatency, processedLen)
 		r.AvgTransformLatency = common.GetAverageFromDuration(sumTransformLatency, processedLen)
 		r.AvgRequestLatency = common.GetAverageFromDuration(sumRequestLatency, processedLen)
+		r.AvgE2ELatency = common.GetAverageFromDuration(sumE2ELatency, processedLen)
 	}
 
 	return &r
@@ -186,6 +204,14 @@ func (wr *TargetWriteResult) Append(nwr *TargetWriteResult) *TargetWriteResult {
 			wrC.MinRequestLatency = nwr.MinRequestLatency
 		}
 		wrC.AvgRequestLatency = common.GetAverageFromDuration(wrC.AvgRequestLatency+nwr.AvgRequestLatency, 2)
+
+		if wrC.MaxE2ELatency < nwr.MaxE2ELatency {
+			wrC.MaxE2ELatency = nwr.MaxE2ELatency
+		}
+		if wrC.MinE2ELatency > nwr.MinE2ELatency || wrC.MinE2ELatency == time.Duration(0) {
+			wrC.MinE2ELatency = nwr.MinE2ELatency
+		}
+		wrC.AvgE2ELatency = common.GetAverageFromDuration(wrC.AvgE2ELatency+nwr.AvgE2ELatency, 2)
 	}
 
 	return &wrC

pkg/models/target_write_result_test.go

@@ -40,30 +40,10 @@ func TestNewTargetWriteResult_EmptyWithoutTime(t *testing.T) {
 	assert.Equal(time.Duration(0), r.MaxTransformLatency)
 	assert.Equal(time.Duration(0), r.MinTransformLatency)
 	assert.Equal(time.Duration(0), r.AvgTransformLatency)
-}
-
-// TestNewTargetWriteResult_EmptyWithTime tests that an empty targetWriteResult with no a provided timestamp will report 0s across the board
-func TestNewTargetWriteResult_EmptyWithTime(t *testing.T) {
-	assert := assert.New(t)
-
-	r := NewTargetWriteResult(nil, nil, nil, nil)
-	assert.NotNil(r)
 
-	assert.Equal(int64(0), r.SentCount)
-	assert.Equal(int64(0), r.FailedCount)
-	assert.Equal(int64(0), r.Total())
-
-	assert.Equal(time.Duration(0), r.MaxProcLatency)
-	assert.Equal(time.Duration(0), r.MinProcLatency)
-	assert.Equal(time.Duration(0), r.AvgProcLatency)
-
-	assert.Equal(time.Duration(0), r.MaxMsgLatency)
-	assert.Equal(time.Duration(0), r.MinMsgLatency)
-	assert.Equal(time.Duration(0), r.AvgMsgLatency)
-
-	assert.Equal(time.Duration(0), r.MaxTransformLatency)
-	assert.Equal(time.Duration(0), r.MinTransformLatency)
-	assert.Equal(time.Duration(0), r.AvgTransformLatency)
+	assert.Equal(time.Duration(0), r.MaxE2ELatency)
+	assert.Equal(time.Duration(0), r.MinE2ELatency)
+	assert.Equal(time.Duration(0), r.AvgE2ELatency)
 }
 
 // TestNewTargetWriteResult_WithMessages tests that reporting of statistics is as it should be when we have all data
@@ -76,6 +56,7 @@ func TestNewTargetWriteResult_WithMessages(t *testing.T) {
 		{
 			Data:                []byte("Baz"),
 			PartitionKey:        "partition1",
+			CollectorTstamp:     timeNow.Add(time.Duration(-60) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-50) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-4) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-2) * time.Minute),
@@ -84,6 +65,7 @@ func TestNewTargetWriteResult_WithMessages(t *testing.T) {
 		{
 			Data:                []byte("Bar"),
 			PartitionKey:        "partition2",
+			CollectorTstamp:     timeNow.Add(time.Duration(-80) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-70) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-7) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-4) * time.Minute),
@@ -94,6 +76,7 @@ func TestNewTargetWriteResult_WithMessages(t *testing.T) {
 		{
 			Data:                []byte("Foo"),
 			PartitionKey:        "partition3",
+			CollectorTstamp:     timeNow.Add(time.Duration(-40) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-30) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-10) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-9) * time.Minute),
@@ -116,11 +99,15 @@ func TestNewTargetWriteResult_WithMessages(t *testing.T) {
 	assert.Equal(time.Duration(3)*time.Minute, r.MaxTransformLatency)
 	assert.Equal(time.Duration(1)*time.Minute, r.MinTransformLatency)
 	assert.Equal(time.Duration(2)*time.Minute, r.AvgTransformLatency)
+	assert.Equal(time.Duration(80)*time.Minute, r.MaxE2ELatency)
+	assert.Equal(time.Duration(40)*time.Minute, r.MinE2ELatency)
+	assert.Equal(time.Duration(60)*time.Minute, r.AvgE2ELatency)
 
 	sent1 := []*Message{
 		{
 			Data:                []byte("Baz"),
 			PartitionKey:        "partition1",
+			CollectorTstamp:     timeNow.Add(time.Duration(-60) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-55) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-2) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-1) * time.Minute),
@@ -131,6 +118,7 @@ func TestNewTargetWriteResult_WithMessages(t *testing.T) {
 		{
 			Data:                []byte("Bar"),
 			PartitionKey:        "partition2",
+			CollectorTstamp:     timeNow.Add(time.Duration(-120) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-75) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-7) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-4) * time.Minute),
@@ -139,6 +127,7 @@ func TestNewTargetWriteResult_WithMessages(t *testing.T) {
 		{
 			Data:                []byte("Foo"),
 			PartitionKey:        "partition3",
+			CollectorTstamp:     timeNow.Add(time.Duration(-30) * time.Minute),
 			TimeCreated:         timeNow.Add(time.Duration(-25) * time.Minute),
 			TimePulled:          timeNow.Add(time.Duration(-15) * time.Minute),
 			TimeTransformed:     timeNow.Add(time.Duration(-7) * time.Minute),
@@ -172,10 +161,13 @@ func TestNewTargetWriteResult_WithMessages(t *testing.T) {
 	assert.Equal(time.Duration(8)*time.Minute, r3.MaxTransformLatency)
 	assert.Equal(time.Duration(1)*time.Minute, r3.MinTransformLatency)
 	assert.Equal(time.Duration(3)*time.Minute, r3.AvgTransformLatency)
+	assert.Equal(time.Duration(120)*time.Minute, r3.MaxE2ELatency)
+	assert.Equal(time.Duration(30)*time.Minute, r3.MinE2ELatency)
+	assert.Equal(time.Duration(65)*time.Minute, r3.AvgE2ELatency)
 }
 
-// TestNewTargetWriteResult_NoTransformation tests that reporting of statistics is as it should be when we don't have a timeTransformed
-func TestNewTargetWriteResult_NoTransformation(t *testing.T) {
+// TestNewTargetWriteResult_NoTransformation tests that reporting of statistics is as it should be when we don't have a timeTransformed and no collector timestamp
+func TestNewTargetWriteResult_NoTransformation_NoE2E(t *testing.T) {
 	assert := assert.New(t)
 
 	timeNow := time.Now().UTC()
@@ -221,4 +213,7 @@ func TestNewTargetWriteResult_NoTransformation(t *testing.T) {
 	assert.Equal(time.Duration(0), r.MaxTransformLatency)
 	assert.Equal(time.Duration(0), r.MinTransformLatency)
 	assert.Equal(time.Duration(0), r.AvgTransformLatency)
+	assert.Equal(time.Duration(0), r.MaxE2ELatency)
+	assert.Equal(time.Duration(0), r.MinE2ELatency)
+	assert.Equal(time.Duration(0), r.AvgE2ELatency)
 }