docs: private void updatePomLabelMap(GavLabel gavLabel, ContainerShutdownDescriptor descriptor) {
          if (gavLabel != null) {
              List<ContainerShutdownDescriptor> descList = shutdownDescriptorPerPomLabelMap.get(gavLabel);
              if (descList == null) {
                  descList = new ArrayList<>();
                  shutdownDescriptorPerPomLabelMap.put(gavLabel, descList);
              }
              descList.add(descriptor);
          }
      }