Provide sample ('complete') json configuration files with all the keys present, demonstrating their usage

A Support customer asked (in ticket https://support.isc.org/Ticket/Display.html?id=13388):

I would like to have a complete json configuration file with all the "keys" present. Is this something you can help me with?

i have searched but not found a complete configuration for kea 1.3 & 1.4

The engineering response was to craft a v4 configuration containing all keys or almost all keys. It comes with the following warning:

Note that this configuration may not be valid, even though it is valid JSON, because usually we don't specify all keys. It is meant to be an example of what parameters can be specified at what level.

This feature request is to formalise the need for such a document, and to extend it to cover other areas of Kea Configuration, starting with v6, and potentially extending to the control agent.

Meanwhile, here is what was generated for v4:

{
  "Dhcp4": {
    "next-server": "192.0.2.123",
    "boot-file-name": "/dev/null",
    "client-classes": [
      {
        "boot-file-name": "",
        "name": "phones_server1",
        "next-server": "0.0.0.0",
        "option-data": [],
        "option-def": [],
        "server-hostname": "",
        "test": "member('HA_server1')"
      },
      {
        "boot-file-name": "",
        "name": "phones_server2",
        "next-server": "0.0.0.0",
        "option-data": [],
        "option-def": [],
        "server-hostname": "",
        "test": "member('HA_server2')"
      },
      {
        "boot-file-name": "",
        "name": "laptops_server1",
        "next-server": "0.0.0.0",
        "option-data": [],
        "option-def": [],
        "server-hostname": "",
        "test": "member('HA_server1')"
      },
      {
        "boot-file-name": "",
        "name": "laptops_server2",
        "next-server": "0.0.0.0",
        "option-data": [],
        "option-def": [],
        "server-hostname": "",
        "test": "member('HA_server2')"
      }
    ],
    "control-socket": {
      "socket-name": "/tmp/kea-dhcp4-ctrl.sock",
      "socket-type": "unix"
    },
    "decline-probation-period": 86400,
    "dhcp-ddns": {
      "always-include-fqdn": false,
      "enable-updates": false,
      "generated-prefix": "myhost",
      "hostname-char-replacement": "",
      "hostname-char-set": "",
      "max-queue-size": 1024,
      "ncr-format": "JSON",
      "ncr-protocol": "UDP",
      "override-client-update": false,
      "override-no-update": false,
      "qualifying-suffix": "",
      "replace-client-name": "never",
      "sender-ip": "0.0.0.0",
      "sender-port": 0,
      "server-ip": "127.0.0.1",
      "server-port": 53001
    },
    "dhcp4o6-port": 0,
    "echo-client-id": true,
    "expired-leases-processing": {
      "flush-reclaimed-timer-wait-time": 25,
      "hold-reclaimed-time": 3600,
      "max-reclaim-leases": 100,
      "max-reclaim-time": 250,
      "reclaim-timer-wait-time": 10,
      "unwarned-reclaim-cycles": 5
    },
    "hooks-libraries": [
      {
        "library": "/home/marcin/devel/kea-build/lib/hooks/libdhcp_lease_cmds.so",
        "parameters": {}
      },
      {
        "library": "/home/marcin/devel/kea-build/lib/hooks/libdhcp_ha.so",
        "parameters": {
          "high-availability": [
            {
              "heartbeat-delay": 10000,
              "max-ack-delay": 5000,
              "max-response-delay": 10000,
              "max-unacked-clients": 0,
              "mode": "load-balancing",
              "peers": [
                {
                  "auto-failover": true,
                  "name": "server1",
                  "role": "primary",
                  "url": "http://192.168.56.33:8080/"
                },
                {
                  "auto-failover": true,
                  "name": "server2",
                  "role": "secondary",
                  "url": "http://192.168.56.66:8080/"
                }
              ],
              "send-lease-updates": true,
              "state-machine": {
                "states": [
                  {
                    "pause": "always",
                    "state": "waiting"
                  },
                  {
                    "pause": "once",
                    "state": "partner-down"
                  }
                ]
              },
              "sync-leases": true,
              "sync-timeout": 60000,
              "this-server-name": "server1"
            }
          ]
        }
      }
    ],
    "host-reservation-identifiers": [
      "hw-address",
      "duid",
      "circuit-id",
      "client-id"
    ],
    "interfaces-config": {
      "dhcp-socket-type": "udp",
      "interfaces": [
        "enp0s8"
      ],
      "re-detect": true
    },
    "lease-database": {
      "lfc-interval": 3600,
      "name": "/home/marcin/devel/kea-build/kea-dhcp4.csv",
      "persist": true,
      "type": "memfile"
    },
    "option-data": [
      {
        "always-send": false,
        "code": 6,
        "csv-format": true,
        "data": "192.0.3.1, 192.0.3.2",
        "name": "domain-name-servers",
        "space": "dhcp4"
      }
    ],
    "option-def": [],
    "rebind-timer": 40,
    "renew-timer": 30,
    "sanity-checks": {
      "lease-checks": "warn"
    },
    "shared-networks": [
      {
        "match-client-id": true,
        "name": "my-secret-network",
        "option-data": [],
        "relay": {
          "ip-addresses": []
        },
        "reservation-mode": "all",
        "require-client-classes": [ "Client_foo" ],
        "subnet4": [
          {
            "4o6-interface": "",
            "4o6-interface-id": "",
            "4o6-subnet": "",
            "boot-file-name": "",
            "id": 1,
            "match-client-id": true,
            "next-server": "0.0.0.0",
            "option-data": [
              {
                "always-send": false,
                "code": 3,
                "csv-format": true,
                "data": "192.0.3.1",
                "name": "routers",
                "space": "dhcp4"
              }
            ],
            "pools": [
              {
                "client-class": "phones_server1",
                "option-data": [],
                "pool": "192.1.0.1/16"
              },
              {
                "client-class": "laptops_server1",
                "option-data": [],
                "pool": "192.2.0.1/16"
              },
              {
                "client-class": "phones_server2",
                "option-data": [],
                "pool": "192.3.0.1/16"
              },
              {
                "client-class": "laptops_server2",
                "option-data": [],
                "pool": "192.4.0.1/16"
              }
            ],
            "rebind-timer": 40,
            "relay": {
              "ip-addresses": [
                "192.168.56.1"
              ]
            },
            "renew-timer": 30,
            "reservation-mode": "all",
            "reservations": [],
            "require-client-classes": [ "Client_foo" ],
            "server-hostname": "",
            "subnet": "192.0.0.0/8",
            "valid-lifetime": 6000
          }
        ]
      }
    ],
    "subnet4": [],
    "valid-lifetime": 6000
  },
  "Logging": {
    "loggers": [
      {
        "debuglevel": 99,
        "name": "kea-dhcp4",
        "output_options": [
          {
            "flush": true,
            "maxsize": 10240000,
            "maxver": 1,
            "output": "stdout"
          }
        ],
        "severity": "INFO"
      },
      {
        "debuglevel": 99,
        "name": "kea-dhcp4.ha_hooks",
        "output_options": [
          {
            "flush": true,
            "maxsize": 10240000,
            "maxver": 1,
            "output": "stdout"
          }
        ],
        "severity": "INFO"
      },
      {
        "debuglevel": 99,
        "name": "kea-dhcp4.commands",
        "output_options": [
          {
            "flush": true,
            "maxsize": 10240000,
            "maxver": 1,
            "output": "stdout"
          }
        ],
        "severity": "INFO"
      },
      {
        "debuglevel": 99,
        "name": "kea-dhcp4.http",
        "output_options": [
          {
            "flush": true,
            "maxsize": 10240000,
            "maxver": 1,
            "output": "stdout"
          }
        ],
        "severity": "INFO"
      }
    ]
  }
}