Introduce a remapping interface and refactor hostmetrics

Author: lahsivjar

Makefile

@@ -0,0 +1,17 @@
+.DEFAULT_GOAL := all
+all: gomodtidy update-licenses fieldalignment fmt
+
+test:
+	go test -v -race ./...
+
+fmt:
+	go run golang.org/x/tools/cmd/goimports@v0.18.0 -w .
+
+gomodtidy:
+	go mod tidy -v
+
+fieldalignment:
+	go run golang.org/x/tools/go/analysis/passes/fieldalignment/cmd/fieldalignment@v0.18.0 -test=false $(shell go list ./... | grep -v test)
+
+update-licenses:
+	go run github.com/elastic/go-licenser@v0.4.1 -ext .go .

go.mod

@@ -0,0 +1,27 @@
+module github.com/elastic/opentelemetry-lib
+
+go 1.21.1
+
+require (
+	github.com/google/go-cmp v0.6.0
+	github.com/stretchr/testify v1.9.0
+	go.opentelemetry.io/collector/pdata v1.7.0
+	go.uber.org/zap v1.27.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/net v0.23.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de // indirect
+	google.golang.org/grpc v1.63.2 // indirect
+	google.golang.org/protobuf v1.34.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,81 @@
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remappers/common/const.go

@@ -0,0 +1,27 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package common
+
+const (
+	// OTelTranslatedLabel is added as an attribute to each datapoint that
+	// is translated from otel.
+	OTelTranslatedLabel = "otel_translated"
+
+	// DatastreamDatasetLabel defines a dataset label for attributes.
+	DatastreamDatasetLabel = "data_stream.dataset"
+)

remappers/hostmetrics/config.go

@@ -0,0 +1,41 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package hostmetrics
+
+type config struct {
+	SystemIntegrationDataset bool
+}
+
+// Option allows configuring the behavior of the hostmetrics remapper.
+type Option func(config) config
+
+func newConfig(opts ...Option) (cfg config) {
+	for _, opt := range opts {
+		cfg = opt(cfg)
+	}
+	return cfg
+}
+
+// WithSystemIntegrationDataset sets the dataset of the remapped metrics as
+// as per the system integration. Example: system.cpu, system.memory, etc.
+func WithSystemIntegrationDataset(b bool) Option {
+	return func(c config) config {
+		c.SystemIntegrationDataset = b
+		return c
+	}
+}

remappers/hostmetrics/config_test.go

@@ -0,0 +1,51 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package hostmetrics
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConfig(t *testing.T) {
+	for _, tc := range []struct {
+		name     string
+		opts     []Option
+		expected config
+	}{
+		{
+			name: "default",
+			opts: nil,
+			expected: config{
+				SystemIntegrationDataset: false,
+			},
+		},
+		{
+			name: "system_integration_dataset",
+			opts: []Option{WithSystemIntegrationDataset(true)},
+			expected: config{
+				SystemIntegrationDataset: true,
+			},
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			assert.Equal(t, tc.expected, newConfig(tc.opts...))
+		})
+	}
+}

remappers/hostmetrics/cpu.go

@@ -1,27 +1,51 @@
+// Licensed to Elasticsearch B.V. under one or more contributor
+// license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright
+// ownership. Elasticsearch B.V. licenses this file to you under
+// the Apache License, Version 2.0 (the "License"); you may
+// not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
 package hostmetrics
 
 import (
+	"errors"
+
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/pdata/pmetric"
 )
 
-func addCPUMetrics(metrics pmetric.MetricSlice, resource pcommon.Resource, dataset string) error {
-	var timestamp pcommon.Timestamp
+func remapCPUMetrics(
+	src, out pmetric.MetricSlice,
+	_ pcommon.Resource,
+	dataset string,
+) error {
+	var timestamp pcommon.Timestamp // Use the timestamp of the last read datapoint
 	var numCores int64
 	var totalPercent, idlePercent, systemPercent, userPercent, stealPercent,
 		iowaitPercent, nicePercent, irqPercent, softirqPercent float64
 
-	// iterate all metrics in the current scope and generate the additional Elastic system integration metrics
-	for i := 0; i < metrics.Len(); i++ {
-		metric := metrics.At(i)
-		if metric.Name() == "system.cpu.logical.count" {
+	// iterate all metrics in the current scope and generate the additional Elastic
+	// system integration metrics.
+	for i := 0; i < src.Len(); i++ {
+		metric := src.At(i)
+		switch metric.Name() {
+		case "system.cpu.logical.count":
 			dp := metric.Sum().DataPoints().At(0)
 			if timestamp == 0 {
 				timestamp = dp.Timestamp()
 			}
-
 			numCores = dp.IntValue()
-		} else if metric.Name() == "system.cpu.utilization" {
+		case "system.cpu.utilization":
 			dataPoints := metric.Gauge().DataPoints()
 			for j := 0; j < dataPoints.Len(); j++ {
 				dp := dataPoints.At(j)
@@ -61,23 +85,8 @@ func addCPUMetrics(metrics pmetric.MetricSlice, resource pcommon.Resource, datas
 		}
 	}
 
-	totalNorm := totalPercent / float64(numCores)
-	idleNorm := idlePercent / float64(numCores)
-	systemNorm := systemPercent / float64(numCores)
-	userNorm := userPercent / float64(numCores)
-	stealNorm := stealPercent / float64(numCores)
-	iowaitNorm := iowaitPercent / float64(numCores)
-	niceNorm := nicePercent / float64(numCores)
-	irqNorm := irqPercent / float64(numCores)
-	softirqNorm := softirqPercent / float64(numCores)
-
-	addMetrics(metrics, resource, dataset,
-		metric{
-			dataType:  pmetric.MetricTypeSum,
-			name:      "system.cpu.cores",
-			timestamp: timestamp,
-			intValue:  &numCores,
-		},
+	// Add all metrics that are independent of cpu logical count.
+	addMetrics(out, dataset, emptyMutator,
 		metric{
 			dataType:    pmetric.MetricTypeGauge,
 			name:        "system.cpu.total.pct",
@@ -132,6 +141,38 @@ func addCPUMetrics(metrics pmetric.MetricSlice, resource pcommon.Resource, datas
 			timestamp:   timestamp,
 			doubleValue: &softirqPercent,
 		},
+	)
+
+	// TODO (lahsivjar): Remove the dependency on the system.cpu.logical.count
+	// metric. The num of cores can be derived from the system.cpu.utilization
+	// metric using the cpu dimension.
+	if numCores == 0 {
+		return errors.New("system.cpu.logical.count metric is missing in the hostmetrics")
+	}
+
+	totalNorm := totalPercent / float64(numCores)
+	idleNorm := idlePercent / float64(numCores)
+	systemNorm := systemPercent / float64(numCores)
+	userNorm := userPercent / float64(numCores)
+	stealNorm := stealPercent / float64(numCores)
+	iowaitNorm := iowaitPercent / float64(numCores)
+	niceNorm := nicePercent / float64(numCores)
+	irqNorm := irqPercent / float64(numCores)
+	softirqNorm := softirqPercent / float64(numCores)
+
+	addMetrics(out, dataset, emptyMutator,
+		metric{
+			dataType:  pmetric.MetricTypeSum,
+			name:      "system.cpu.cores",
+			timestamp: timestamp,
+			intValue:  &numCores,
+		},
+		metric{
+			dataType:  pmetric.MetricTypeSum,
+			name:      "system.load.cores",
+			timestamp: timestamp,
+			intValue:  &numCores,
+		},
 		metric{
 			dataType:    pmetric.MetricTypeGauge,
 			name:        "system.cpu.total.norm.pct",