fix: gracefully handle process metrics registration failure on unsupported OSes

.chloggen/fix-aix-crash.yaml

@@ -0,0 +1,5 @@
+change_logs:
+  - change_type: bug_fix
+    component: opentelemetry-collector
+    note: "Fix panic in process metrics on unsupported OSes (e.g. AIX)"
+    issues: [14307]

service/service.go

@@ -234,8 +234,17 @@ 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.
+	const osAIX = "aix"
+	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
 }