@GET
  public HbckMetrics getBaseHbckMetrics() {
    return new HbckMetrics(hbckReport.getCheckingStartTimestamp().toEpochMilli(),
      hbckReport.getCheckingEndTimestamp().toEpochMilli(), getOrphanRegionsOnFS(),
      getOrphanRegionsOnRS(), getInconsistentRegions(), getRegionChainHoles(),
      getRegionChainOverlap(), getUnknownServers(), getEmptyRegionInfo());
  }
The root object exposing hbck.jsp page as JSON Output.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/http/hbck/resource/HbckMetricsResource.java