OPNSense

The API key & secret can be generated via the webui by creating a new user at System/Access/Users. Ensure "Generate a scrambled password to prevent local database logins for this user" is checked and then edit the effective privileges selecting only:

• Diagnostics: System Activity
• Status: Traffic Graph

Finally, create a new API key which will download an apikey.txt file with your key and secret in it. Use the values as the username and password fields, respectively, in your homepage config.

Allowed fields: ["cpu", "memory", "wanUpload", "wanDownload"].

widget:
    type: opnsense
    url: http://opnsense.host.or.ip
    username: key
    password: secret