@Override
  protected ProcedureMetrics getProcedureMetrics(MasterProcedureEnv env) {
    return env.getAssignmentManager().getAssignmentManagerMetrics().getOpenProcMetrics();
  }
The remote procedure used to open a region.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/OpenRegionProcedure.java