Introduce an interface to translate hostmetrics and add tests

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@v0.21.0 -w .
+
+gomodtidy:
+	go mod tidy -v
+
+fieldalignment:
+	go run golang.org/x/tools/go/analysis/passes/fieldalignment/cmd/fieldalignment@v0.21.0 -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 +1,23 @@
+// 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 (
+	// 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
+	}
+}