receiver/prometheusremotewrite: Add two fields timestamp and value.

Convert sample timestamps from milliseconds to nanoseconds. Set
datapoint values using SetDoubleValue based on incoming sample values.
Update tests in translateV2 to verify that samples are correctly
ingested and their timestamps properly converted.

Fixes part of open-telemetry#37277.

Signed-off-by: sujal shah <[email protected]>

.chloggen/prw-timestamp-handling.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: receiver/prometheusremotewrite
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Add value and timestamp handling in the Prometheus Remote Write receiver by using SetDoubleValue and SetTimestamp"
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [37277]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [user]

receiver/prometheusremotewritereceiver/receiver.go

@@ -1,6 +1,6 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
-
+// receiver/prometheusremotewritereceiver/receiver.go
 package prometheusremotewritereceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/prometheusremotewritereceiver"
 
 import (
@@ -269,15 +269,23 @@ func addHistogramDatapoints(_ pmetric.ResourceMetrics, _ labels.Labels, _ writev
 // addDatapoints adds the labels to the datapoints attributes.
 // TODO: We're still not handling several fields that make a datapoint complete, e.g. StartTimestamp,
 // Timestamp, Value, etc.
-func addDatapoints(datapoints pmetric.NumberDataPointSlice, ls labels.Labels, _ writev2.TimeSeries) {
-	attributes := datapoints.AppendEmpty().Attributes()
-
-	for _, l := range ls {
-		if l.Name == "instance" || l.Name == "job" || // Become resource attributes "service.name", "service.instance.id" and "service.namespace"
-			l.Name == labels.MetricName || // Becomes metric name
-			l.Name == "otel_scope_name" || l.Name == "otel_scope_version" { // Becomes scope name and version
-			continue
+func addDatapoints(datapoints pmetric.NumberDataPointSlice, ls labels.Labels, ts writev2.TimeSeries) {
+	// Add samples from the timeseries
+	for _, sample := range ts.Samples {
+		dp := datapoints.AppendEmpty()
+
+		// Set timestamp in nanoseconds (Prometheus uses milliseconds)
+		dp.SetTimestamp(pcommon.Timestamp(sample.Timestamp * 1e6))
+		dp.SetDoubleValue(sample.Value)
+
+		attributes := dp.Attributes()
+		for _, l := range ls {
+			if l.Name == "instance" || l.Name == "job" || // Become resource attributes
+				l.Name == labels.MetricName || // Becomes metric name
+				l.Name == "otel_scope_name" || l.Name == "otel_scope_version" { // Becomes scope name and version
+				continue
+			}
+			attributes.PutStr(l.Name, l.Value)
 		}
-		attributes.PutStr(l.Name, l.Value)
 	}
 }

receiver/prometheusremotewritereceiver/receiver_test.go

@@ -18,6 +18,7 @@ import (
 	"github.com/prometheus/prometheus/storage/remote"
 	"github.com/stretchr/testify/assert"
 	"go.opentelemetry.io/collector/consumer/consumertest"
+	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 	"go.opentelemetry.io/collector/receiver/receivertest"
 
@@ -149,17 +150,17 @@ func TestTranslateV2(t *testing.T) {
 				Timeseries: []writev2.TimeSeries{
 					{
 						Metadata:   writev2.Metadata{Type: writev2.Metadata_METRIC_TYPE_GAUGE},
-						LabelsRefs: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16}, // Same scope: scope_name: scope1. scope_version v1
+						LabelsRefs: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16},
 						Samples:    []writev2.Sample{{Value: 1, Timestamp: 1}},
 					},
 					{
 						Metadata:   writev2.Metadata{Type: writev2.Metadata_METRIC_TYPE_GAUGE},
-						LabelsRefs: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16}, // Same scope: scope_name: scope1. scope_version v1
+						LabelsRefs: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 16},
 						Samples:    []writev2.Sample{{Value: 2, Timestamp: 2}},
 					},
 					{
 						Metadata:   writev2.Metadata{Type: writev2.Metadata_METRIC_TYPE_GAUGE},
-						LabelsRefs: []uint32{1, 2, 3, 4, 5, 6, 11, 12, 13, 14, 17, 18}, // Different scope: scope_name: scope2. scope_version v2
+						LabelsRefs: []uint32{1, 2, 3, 4, 5, 6, 11, 12, 13, 14, 17, 18},
 						Samples:    []writev2.Sample{{Value: 3, Timestamp: 3}},
 					},
 				},
@@ -171,19 +172,30 @@ func TestTranslateV2(t *testing.T) {
 				rmAttributes1.PutStr("service.namespace", "service-x")
 				rmAttributes1.PutStr("service.name", "test")
 				rmAttributes1.PutStr("service.instance.id", "107cn001")
+
 				sm1 := rm1.ScopeMetrics().AppendEmpty()
 				sm1.Scope().SetName("scope1")
 				sm1.Scope().SetVersion("v1")
-				sm1Attributes := sm1.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty().Attributes()
-				sm1Attributes.PutStr("d", "e")
-				sm2Attributes := sm1.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty().Attributes()
-				sm2Attributes.PutStr("d", "e")
+
+				dp1 := sm1.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty()
+				dp1.SetTimestamp(pcommon.Timestamp(1 * 1e6))
+				dp1.SetDoubleValue(1.0)
+				dp1.Attributes().PutStr("d", "e")
+
+				dp2 := sm1.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty()
+				dp2.SetTimestamp(pcommon.Timestamp(2 * 1e6))
+				dp2.SetDoubleValue(2.0)
+				dp2.Attributes().PutStr("d", "e")
 
 				sm2 := rm1.ScopeMetrics().AppendEmpty()
 				sm2.Scope().SetName("scope2")
 				sm2.Scope().SetVersion("v2")
-				sm3Attributes := sm2.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty().Attributes()
-				sm3Attributes.PutStr("foo", "bar")
+
+				dp3 := sm2.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty()
+				dp3.SetTimestamp(pcommon.Timestamp(3 * 1e6))
+				dp3.SetDoubleValue(3.0)
+				dp3.Attributes().PutStr("foo", "bar")
+
 				return expected
 			}(),
 			expectedStats: remote.WriteResponseStats{},
@@ -224,23 +236,30 @@ func TestTranslateV2(t *testing.T) {
 				rmAttributes1.PutStr("service.namespace", "service-x")
 				rmAttributes1.PutStr("service.name", "test")
 				rmAttributes1.PutStr("service.instance.id", "107cn001")
+
 				sm1 := rm1.ScopeMetrics().AppendEmpty()
-				sm1Attributes := sm1.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty().Attributes()
-				sm1Attributes.PutStr("d", "e")
-				sm1Attributes.PutStr("foo", "bar")
-				// Since we don't check "scope_name" and "scope_version", we end up with duplicated scope metrics for repeated series.
-				// TODO: Properly handle scope metrics.
-				sm2Attributes := sm1.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty().Attributes()
-				sm2Attributes.PutStr("d", "e")
-				sm2Attributes.PutStr("foo", "bar")
+				dp1 := sm1.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty()
+				dp1.SetTimestamp(pcommon.Timestamp(1 * 1e6))
+				dp1.SetDoubleValue(1.0)
+				dp1.Attributes().PutStr("d", "e")
+				dp1.Attributes().PutStr("foo", "bar")
+
+				dp2 := sm1.Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty()
+				dp2.SetTimestamp(pcommon.Timestamp(2 * 1e6))
+				dp2.SetDoubleValue(2.0)
+				dp2.Attributes().PutStr("d", "e")
+				dp2.Attributes().PutStr("foo", "bar")
 
 				rm2 := expected.ResourceMetrics().AppendEmpty()
 				rmAttributes2 := rm2.Resource().Attributes()
 				rmAttributes2.PutStr("service.name", "foo")
 				rmAttributes2.PutStr("service.instance.id", "bar")
-				mAttributes2 := rm2.ScopeMetrics().AppendEmpty().Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty().Attributes()
-				mAttributes2.PutStr("d", "e")
-				mAttributes2.PutStr("foo", "bar")
+
+				dp3 := rm2.ScopeMetrics().AppendEmpty().Metrics().AppendEmpty().SetEmptyGauge().DataPoints().AppendEmpty()
+				dp3.SetTimestamp(pcommon.Timestamp(2 * 1e6))
+				dp3.SetDoubleValue(2.0)
+				dp3.Attributes().PutStr("d", "e")
+				dp3.Attributes().PutStr("foo", "bar")
 
 				return expected
 			}(),