code: <T> WABTracker<T> getTracker(BundleTrackerCustomizer<T> wabTrackerCustomizer) {
          try {
              //we are interested in WABs that are starting (could be lazy activation)
              //or already active
              int mask = Bundle.STARTING | Bundle.ACTIVE;
              return new WABTracker<T>(ctx, mask, wabTrackerCustomizer);
          } catch (Exception e) {
              // If this goes wrong FFDC and log the error as we won't be able to be used
              Tr.error(tc, "bundle.tracker.init.fail");
          }
          return null;
      }
docs: /* Package protected method to allow WAB's to obtain bundle trackers too