Learn more about Zabbix. The widget supports (at least) Zabbix server version 7.0.

Allowed fields: ["unclassified", "information", "warning", "average", "high", "disaster"].

Only 4 fields can be shown at a time, with the default being: ["warning", "average", "high", "disaster"].

widget:
  type: zabbix
  url: http://zabbix.host.or.ip/zabbix
  key: your-api-key

See the Zabbix documentation for details on generating API tokens.