{
  "type": "object",
  "properties": {
    "description": {
      "type": ["string", "null"],
      "description": "backend description"
    },
    "default_backend_param": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "default backend parameter"
    },
    "default_run_command": {
      "type": ["string", "null"],
      "description": "default start command"
    },
    "health_check_path": {
      "type": ["string", "null"],
      "description": "health check path"
    },
    "version_configs": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z0-9._-]+$": {
          "type": "object",
          "properties": {
            "image_name": {
              "type": "string",
              "description": "image name"
            },
            "run_command": {
              "type": ["string", "null"],
              "description": "start command"
            },
            "custom_framework": {
              "type": ["string", "null"],
              "description": "custom framework"
            }
          },
          "required": ["image_name", "run_command"],
          "additionalProperties": false
        }
      },
      "additionalProperties": false,
      "description": "multiple backend versions"
    }
  },
  "required": ["version_configs"],
  "additionalProperties": false
}