[processor/resourcedetection] Add feature gate to change family and m…

…odel to string (open-telemetry#29152)

**Description:** 

Add feature gate to change family and CPU model to string, to adapt to
open-telemetry/semantic-conventions/issues/495.

**Link to tracking Issue:** Fixes open-telemetry#29025

**Testing:** Tested with the sample configuration on open-telemetry#26533.

.chloggen/mx-psi_change-to-string.yaml

@@ -0,0 +1,28 @@
+# 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: processor/resourcedetection
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add `processor.resourcedetection.hostCPUModelAndFamilyAsString` feature gate to change the type of `host.cpu.family` and `host.cpu.model.id` attributes from `int` to `string`.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [29025]
+
+# (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: |
+  This feature gate will graduate to beta in the next release.
+
+# 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: []

processor/resourcedetectionprocessor/internal/system/internal/metadata/resource_int_version.go

@@ -0,0 +1,18 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package metadata // import "github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor/internal/system/internal/metadata"
+
+// SetHostCPUFamilyAsInt sets provided value as "host.cpu.family" attribute as int.
+func (rb *ResourceBuilder) SetHostCPUFamilyAsInt(val int64) {
+	if rb.config.HostCPUFamily.Enabled {
+		rb.res.Attributes().PutInt("host.cpu.family", val)
+	}
+}
+
+// SetHostCPUModelIDAsInt sets provided value as "host.cpu.model.id" attribute as int.
+func (rb *ResourceBuilder) SetHostCPUModelIDAsInt(val int64) {
+	if rb.config.HostCPUModelID.Enabled {
+		rb.res.Attributes().PutInt("host.cpu.model.id", val)
+	}
+}

processor/resourcedetectionprocessor/internal/system/metadata.yaml

@@ -29,11 +29,11 @@ resource_attributes:
     enabled: false
   host.cpu.family:
     description: The host.cpu.family
-    type: int
+    type: string
     enabled: false
   host.cpu.model.id:
     description: The host.cpu.model.id
-    type: int
+    type: string
     enabled: false
   host.cpu.model.name:
     description: The host.cpu.model.name

processor/resourcedetectionprocessor/internal/system/system.go

@@ -10,6 +10,7 @@ import (
 	"strconv"
 
 	"github.com/shirou/gopsutil/v3/cpu"
+	"go.opentelemetry.io/collector/featuregate"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/processor"
 	conventions "go.opentelemetry.io/collector/semconv/v1.6.1"
@@ -20,6 +21,17 @@ import (
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor/internal/system/internal/metadata"
 )
 
+var (
+	hostCPUModelAndFamilyAsStringID          = "processor.resourcedetection.hostCPUModelAndFamilyAsString"
+	hostCPUModelAndFamilyAsStringFeatureGate = featuregate.GlobalRegistry().MustRegister(
+		hostCPUModelAndFamilyAsStringID,
+		featuregate.StageAlpha,
+		featuregate.WithRegisterDescription("Change type of host.cpu.model.id and host.cpu.model.family to string."),
+		featuregate.WithRegisterFromVersion("v0.89.0"),
+		featuregate.WithRegisterReferenceURL("https://github.com/open-telemetry/semantic-conventions/issues/495"),
+	)
+)
+
 const (
 	// TypeStr is type of detector.
 	TypeStr = "system"
@@ -147,21 +159,39 @@ func reverseLookupHost(d *Detector) (string, error) {
 func setHostCPUInfo(d *Detector, cpuInfo cpu.InfoStat) error {
 	d.logger.Debug("getting host's cpuinfo", zap.String("coreID", cpuInfo.CoreID))
 	d.rb.SetHostCPUVendorID(cpuInfo.VendorID)
-	family, err := strconv.ParseInt(cpuInfo.Family, 10, 64)
-	if err != nil {
-		return fmt.Errorf("failed to convert cpuinfo family to integer: %w", err)
+	if hostCPUModelAndFamilyAsStringFeatureGate.IsEnabled() {
+		d.rb.SetHostCPUFamily(cpuInfo.Family)
+	} else {
+		// https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/29025
+		d.logger.Warn("This attribute will change from int to string. Switch now using the feature gate.",
+			zap.String("attribute", "host.cpu.family"),
+			zap.String("feature gate", hostCPUModelAndFamilyAsStringID),
+		)
+		family, err := strconv.ParseInt(cpuInfo.Family, 10, 64)
+		if err != nil {
+			return fmt.Errorf("failed to convert cpuinfo family to integer: %w", err)
+		}
+		d.rb.SetHostCPUFamilyAsInt(family)
 	}
-	d.rb.SetHostCPUFamily(family)
 
 	// For windows, this field is left blank. See https://github.com/shirou/gopsutil/blob/v3.23.9/cpu/cpu_windows.go#L113
 	// Skip setting modelId if the field is blank.
 	// ISSUE: https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/27675
 	if cpuInfo.Model != "" {
-		model, err := strconv.ParseInt(cpuInfo.Model, 10, 64)
-		if err != nil {
-			return fmt.Errorf("failed to convert cpuinfo model to integer: %w", err)
+		if hostCPUModelAndFamilyAsStringFeatureGate.IsEnabled() {
+			d.rb.SetHostCPUModelID(cpuInfo.Model)
+		} else {
+			// https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/29025
+			d.logger.Warn("This attribute will change from int to string. Switch now using the feature gate.",
+				zap.String("attribute", "host.cpu.model.id"),
+				zap.String("feature gate", hostCPUModelAndFamilyAsStringID),
+			)
+			model, err := strconv.ParseInt(cpuInfo.Model, 10, 64)
+			if err != nil {
+				return fmt.Errorf("failed to convert cpuinfo model to integer: %w", err)
+			}
+			d.rb.SetHostCPUModelIDAsInt(model)
 		}
-		d.rb.SetHostCPUModelID(model)
 	}
 
 	d.rb.SetHostCPUModelName(cpuInfo.ModelName)