Missing `advanced` field from HAProxy backend servers

[sherif-fanous]

First, thanks for the awesome API 🙏🏼

Describe the bug

I have an HAProxy backend setup with multiple servers in an active/standby setup.

To setup the standby servers I specify the backup directive in the Advanced textbox within the GUI as per the following screenshot

This field is not returned by the API GET /api/v2/services/haproxy/backends. Only the following fields are returned

{
  'parent_id': 18,
  'id': 1,
  'name': 'redacted',
  'status': 'active',
  'address': 'redacted',
  'port': '80',
  'weight': 1,
  'ssl': False,
  'sslserververify': False,
  'serverid': 790
}

Because this field is missing when I later on in the code update this backend using the PATCH /api/v2/services/haproxy/backend endpoint I end up with the servers without the backup directive

Expected behavior
The endpoints that retrieve backends should retrieve all the backend server fields

pfSense Version & Package Version:

• pfSense Version: 24.11
• Package Version: 2.4.1

[sherif-fanous]

For reference this is what the backend server appears in /conf/config.xml

<ha_servers>
        <item>
                <status>active</status>
                <name>redacted</name>
                <address>redacted</address>
                <port>80</port>
                <weight>1</weight>
                <id>136</id>
                <advanced>backup</advanced>
                <_index></_index>
        </item>
</ha_servers>