fix: attributes incorrectly added as extra fields in gelf

pkg/exporters/gelf_exporter/trace.go

@@ -80,7 +80,6 @@ func (e *Exporter) ExportSpans(ctx context.Context, spans []trace.ReadOnlySpan)
 				// Defaults to ALERT since we consider lack of the level a serious error that should be fixed ASAP.
 				// Otherwise some dangerous unexpected behaviour could go unnoticed.
 				Level: syslog.ALERT,
-				ExtraFields: attributes,
 			}
 			for _, attrKV := range event.Attributes {
 				if attrKV.Key == attr.LogMessageLongKey {
@@ -100,6 +99,7 @@ func (e *Exporter) ExportSpans(ctx context.Context, spans []trace.ReadOnlySpan)
 				attributes[string(attrKV.Key)] = GetByType(attrKV.Value)
 			}
 
+			gelf.ExtraFields = attributes
 			Log(e.gelfWriter, gelf)
 		}