code: @Override
      public void register(final String name, final long ttl, final TimeUnit timeUnit) {
  
          logger.info("HealthService::register() {} {} {}", name, ttl, timeUnit);
          final NodeHealthStat nodeHealthStat = new NodeHealthStat(name, timeUnit.toMillis(ttl));
          serviceHealthStatMap.put(name, nodeHealthStat);
          super.incrementCount("nodes");
          super.recordLevel("nodes", serviceHealthStatMap.size());
  
  
      }
docs: Register method to register services / internal nodes.
  
  @param name     name
  @param ttl      ttl
  @param timeUnit timeUnit