* 2026-10-02 3.4.2
  cache the classification result
* 2026-09-30 3.4.1.2
  bugfix in Raritan sensors: complete PDU2-MIB enum maps from the current 2025-04-28 MIB
  (fixes unknown sensor type/state/units)
  Skip sensor slots in the unavailable state
* 2026-05-22 3.4.1.1
  bugfix in Raritan sensors, use the device's own thresholds
* 2026-04-20 3.4.1
  update GLPlugin
* 2026-04-16 3.4
  add APC Rack PDU
* 2025-11-12 3.3
  initial support for Avocent PM1000/2000/3000 PDU series (PR#1)
* 2025-09-05 3.2
  add vertiv v5 thd sensors
* 2025-09-03 3.1.1
  add a2d sensors (flood, door, volt, leak)
* 2025-09-03 3.1.0.1
  adjust default thresholds for Vertiv
* 2025-08-07 3.1
  check t3hd sensors of Vertiv V5 devices
* 2025-05-05 3.0.2.2
  update glplugin and version
* 2025-04-22 3.0.2.1
  workaround for 7.1.4 firmware of APC/Schneider ATS atsStatusVoltageOutStatus
* 2024-10-08 3.0.2
  bugfix in PDU2 perfdata. temp and hum may have the same sensor name, now it's prefixed
* 2024-07-24 3.0.1.1
  bugfix in PDU2 OnOff Sensor
* 2023-10-06 3.0.1
  update PDU2-MIB and Monitoring::GLPlugin
* 2023-07-24 3.0
  restructured the plugin to make it more suitable and robust when used in an embedded perl worker
* 2023-07-14 2.5
  support Vertiv v5
* 2022-02-22 2.4.0.2
  output full message for raritan/rittal sensors
* 2020-02-04 2.4.0.1
  fix a bug for PowerMIB devices which don't implement all voltage oids
* 2016-12-05 2.4
  support Emerson Liebert
* 2016-08-12 2.3.1.1
  update GLPlugin/Extraopts
* 2016-06-23 2.3.1
  allow --name selecting of in/outputs for damocles
* 2016-06-16 2.3.0.1
  bugfix for damocles without any sensors
* 2016-06-16 2.3
  support HWD Damocles
* 2016-06-03 2.2.0.1
  update GLPlugin
* 2016-02-08 2.2
  add GLPlugin submodule
* 2016-02-02 2.1
  add alerts for apc ats metrics
* 2016-02-01 2.0.1
  better thresholds for apc ats power/load
* 2016-01-29 2.0
  support APC ATS, new autoload GLPlugin
* 2015-11-12 1.2
  support Server Technology Sentry3 and Sentry4
* 2015-07-13 1.1
  new directory layout, standalone
* 2015-04-23 1.0.1.1
  update GLPlugin[SNMP]
* 2015-01-26 1.0.1
  update GLPlugin[SNMP]
* 2014-12-22 1.0
  initial release
