rrddim_add(stm, "persons", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(stm, "machines", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(stm, "persons", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);
rrddim_add(stm, "machines", NULL, 1, 1024, RRD_ALGORITHM_ABSOLUTE);