docs: protected boolean isSlopDead(Cluster cluster, Set<String> storeNames, Slop slop) {
          // destination node , no longer exists
          if(!cluster.getNodeIds().contains(slop.getNodeId())) {
              return true;
          }
  
          // destination store, no longer exists
          if(!storeNames.contains(slop.getStoreName())) {
              return true;
          }
  
          // else. slop is alive
          return false;
      }