fix: gracefully handle process metrics registration failure on unsupported OSes

.chloggen/fix-aix-crash.yaml

@@ -0,0 +1,4 @@
+change_type: bug_fix
+component: opentelemetry-collector
+note: "Fix panic in process metrics on unsupported OSes (e.g. AIX)"
+issues: [14307]

service/service.go

@@ -36,6 +36,8 @@ import (
 	"go.opentelemetry.io/collector/service/telemetry"
 )
 
+const osAIX = "aix"
+
 // This feature gate is deprecated and will be removed in 1.40.0. Views can now be configured.
 var _ = featuregate.GlobalRegistry().MustRegister(
 	"telemetry.disableHighCardinalityMetrics",
@@ -234,8 +236,16 @@ func New(ctx context.Context, set Settings, cfg Config) (_ *Service, resultErr e
 		return nil, err
 	}
 
-	if err := proctelemetry.RegisterProcessMetrics(srv.telemetrySettings); err != nil {
-		return nil, fmt.Errorf("failed to register process metrics: %w", err)
+	// Only register process metrics on supported OSes.
+	if runtime.GOOS == osAIX {
+		// AIX is currently unsupported for process metrics, so we skip it to avoid crashing.
+		// We log this so the user is aware that metrics are disabled.
+		srv.telemetrySettings.Logger.Info("Skipping process metrics registration on unsupported OS", zap.String("os", runtime.GOOS))
+	} else {
+		// For other OSes, we want to fail fast if registration fails.
+		if err := proctelemetry.RegisterProcessMetrics(srv.telemetrySettings); err != nil {
+			return nil, err
+		}
 	}
 	return srv, nil
 }