code: public void syncTopologyMetaForFollower() {
          // sys meta, use remote only
          syncSysMetaFromRemote();
  
          // normal topology meta, local + remote
          for (Entry<String, TopologyMetricContext> entry : context.getTopologyMetricContexts().entrySet()) {
              String topology = entry.getKey();
              TopologyMetricContext metricContext = entry.getValue();
  
              if (!JStormMetrics.SYS_TOPOLOGY_SET.contains(topology)) {
                  try {
                      syncMetaFromCache(topology, metricContext);
                      syncNonSysMetaFromRemote(topology, metricContext);
                  } catch (Exception e1) {
                      LOG.warn("failed to sync meta for topology:{}", topology);
                  }
              }
          }
      }
docs: sync topology metric meta from external storage like TDDL/OTS.
  nimbus server will skip syncing, only followers do this