$rrd_def_signatures_alert = RrdDefinition::make()
    ->addDataset('signatures_alert', 'GAUGE', 0)
    ->addDataset('s0signatures_alert', 'GAUGE', 0)
    ->addDataset('s1signatures_alert', 'GAUGE', 0)
    ->addDataset('s2signatures_alert', 'GAUGE', 0)