@Override
      public void fillInToString(StringBuilder sb) {
        super.fillInToString(sb);
        sb.append("; isPrimary=").append(isPrimary);
        sb.append("; hasRegisteredInterest=").append(hasRegisteredInterest);
      }
HARegions have their own advisors so that interest registration state can be tracked
geode-core/src/main/java/org/apache/geode/internal/cache/HARegion.java