Zabbix 6.0

[kodiakastu]

Would solve part of #12 memory feeds from ER (works with my ER-6P) and corrections to #13 that I closed.

• Update zbx_edgemax_template.xml

  • Imported and exported to Zabbix 6.0
  • Replaced linked template with "Generic by SNMP"
  • Renamed Template to align with Zabbix's naming

• Update zbx_edgemax_template.xml

  • Replaced SNMP variable with their OID beacause UCD-SNMP-MIB::memAvailReal & UCD-SNMP-MIB::memTotalReal are not defined