[processor/resourcedetection] Fetch CPU info only if required (#33774)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
This PR changes the system resource detector so as to only try to fetch
the CPU info when required. The CPU info attributes are disabled by
default so we should only fetch this information when at least one of
those is enabled.

**Link to tracking Issue:** <Issue number if applicable>
#33768

**Testing:** <Describe what testing was performed and which tests were
added.> Added unti-tests

**Documentation:** <Describe the documentation added.> ~

/cc @mx-psi

---------

Signed-off-by: ChrsMark <chrismarkou92@gmail.com>

.chloggen/call_cpu_info_only_on_demand.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: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: resourcedetectionprocessor
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fetch CPU info only if related attributes are enabled
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [33774]
+
+# (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]

internal/metadataproviders/go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/docker/docker v25.0.5+incompatible
 	github.com/hashicorp/consul/api v1.29.1
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8sconfig v0.103.0
+	github.com/shirou/gopsutil/v4 v4.24.5
 	github.com/stretchr/testify v1.9.0
 	go.opentelemetry.io/collector/semconv v0.103.0
 	go.opentelemetry.io/otel v1.27.0
@@ -32,6 +33,7 @@ require (
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-logr/logr v1.4.1 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/go-openapi/jsonpointer v0.19.6 // indirect
 	github.com/go-openapi/jsonreference v0.20.2 // indirect
 	github.com/go-openapi/swag v0.22.3 // indirect
@@ -53,6 +55,7 @@ require (
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
@@ -69,8 +72,13 @@ require (
 	github.com/openshift/client-go v0.0.0-20210521082421-73d9475a9142 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/shoenig/go-m1cpu v0.1.6 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/stretchr/objx v0.5.2 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.24.0 // indirect
 	go.opentelemetry.io/otel/metric v1.27.0 // indirect

internal/metadataproviders/system/metadata.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 
 	"github.com/Showmax/go-fqdn"
+	"github.com/shirou/gopsutil/v4/cpu"
 	conventions "go.opentelemetry.io/collector/semconv/v1.6.1"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/sdk/resource"
@@ -69,6 +70,9 @@ type Provider interface {
 
 	// HostMACs returns the host's MAC addresses
 	HostMACs() ([]net.HardwareAddr, error)
+
+	// CPUInfo returns the host's CPU info
+	CPUInfo(ctx context.Context) ([]cpu.InfoStat, error)
 }
 
 type systemMetadataProvider struct {
@@ -216,3 +220,7 @@ func (p systemMetadataProvider) HostMACs() (macs []net.HardwareAddr, err error)
 	}
 	return macs, err
 }
+
+func (p systemMetadataProvider) CPUInfo(ctx context.Context) ([]cpu.InfoStat, error) {
+	return cpu.InfoWithContext(ctx)
+}

processor/resourcedetectionprocessor/internal/system/system.go

@@ -130,9 +130,14 @@ func (d *Detector) Detect(ctx context.Context) (resource pcommon.Resource, schem
 		return pcommon.NewResource(), "", fmt.Errorf("failed getting OS description: %w", err)
 	}
 
-	cpuInfo, err := cpu.Info()
-	if err != nil {
-		return pcommon.NewResource(), "", fmt.Errorf("failed getting host cpuinfo: %w", err)
+	var cpuInfo []cpu.InfoStat
+	if d.cfg.ResourceAttributes.HostCPUCacheL2Size.Enabled || d.cfg.ResourceAttributes.HostCPUFamily.Enabled ||
+		d.cfg.ResourceAttributes.HostCPUModelID.Enabled || d.cfg.ResourceAttributes.HostCPUVendorID.Enabled ||
+		d.cfg.ResourceAttributes.HostCPUModelName.Enabled || d.cfg.ResourceAttributes.HostCPUStepping.Enabled {
+		cpuInfo, err = d.provider.CPUInfo(ctx)
+		if err != nil {
+			return pcommon.NewResource(), "", fmt.Errorf("failed getting host cpuinfo: %w", err)
+		}
 	}
 
 	for _, source := range d.cfg.HostnameSources {

processor/resourcedetectionprocessor/internal/system/system_test.go

@@ -9,6 +9,7 @@ import (
 	"net"
 	"testing"
 
+	"github.com/shirou/gopsutil/v4/cpu"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
@@ -77,6 +78,11 @@ func (m *mockMetadata) HostMACs() ([]net.HardwareAddr, error) {
 	return args.Get(0).([]net.HardwareAddr), args.Error(1)
 }
 
+func (m *mockMetadata) CPUInfo(_ context.Context) ([]cpu.InfoStat, error) {
+	args := m.MethodCalled("CPUInfo")
+	return args.Get(0).([]cpu.InfoStat), args.Error(1)
+}
+
 var (
 	testIPsAttribute = []any{"192.168.1.140", "fe80::abc2:4a28:737a:609e"}
 	testIPsAddresses = []net.IP{net.ParseIP(testIPsAttribute[0].(string)), net.ParseIP(testIPsAttribute[1].(string))}
@@ -159,6 +165,7 @@ func TestDetectFQDNAvailable(t *testing.T) {
 	require.NoError(t, err)
 	assert.Equal(t, conventions.SchemaURL, schemaURL)
 	md.AssertExpectations(t)
+	md.AssertNotCalled(t, "CPUInfo")
 
 	expected := map[string]any{
 		conventions.AttributeHostName:      "fqdn",
@@ -330,6 +337,40 @@ func TestDetectError(t *testing.T) {
 	}, res.Attributes().AsRaw())
 }
 
+func TestDetectCPUInfo(t *testing.T) {
+	md := &mockMetadata{}
+	md.On("FQDN").Return("fqdn", nil)
+	md.On("OSDescription").Return("Ubuntu 22.04.2 LTS (Jammy Jellyfish)", nil)
+	md.On("OSType").Return("darwin", nil)
+	md.On("HostID").Return("2", nil)
+	md.On("HostArch").Return("amd64", nil)
+	md.On("HostIPs").Return(testIPsAddresses, nil)
+	md.On("HostMACs").Return(testMACsAddresses, nil)
+	md.On("CPUInfo").Return([]cpu.InfoStat{{Family: "some"}}, nil)
+
+	cfg := allEnabledConfig()
+	cfg.HostCPUFamily.Enabled = true
+	detector := newTestDetector(md, []string{"dns"}, cfg)
+	res, schemaURL, err := detector.Detect(context.Background())
+	require.NoError(t, err)
+	assert.Equal(t, conventions.SchemaURL, schemaURL)
+	md.AssertExpectations(t)
+
+	expected := map[string]any{
+		conventions.AttributeHostName:      "fqdn",
+		conventions.AttributeOSDescription: "Ubuntu 22.04.2 LTS (Jammy Jellyfish)",
+		conventions.AttributeOSType:        "darwin",
+		conventions.AttributeHostID:        "2",
+		conventions.AttributeHostArch:      conventions.AttributeHostArchAMD64,
+		"host.ip":                          testIPsAttribute,
+		"host.mac":                         testMACsAttribute,
+		"host.cpu.family":                  "some",
+	}
+
+	assert.Equal(t, expected, res.Attributes().AsRaw())
+
+}
+
 func newTestDetector(mock *mockMetadata, hostnameSources []string, resCfg metadata.ResourceAttributesConfig) *Detector {
 	return &Detector{
 		provider: mock,