string , x ∈ { "Db not working","Redis not working" }

"/aws/healthcheck": {
      "get": {
        "tags": [
          "Healthcheck"
        ],
        "summary": "Returns service status",
        "description": "Checks if our APIs are online",
        "operationId": "getStatus",
        "produces": [
          "application/json"
        ],
        "responses": {
          "200": {
            "description": "All services online"
          },
          "500": {
            "description": "Something is wrong",
            "schema": {
              "type": "string",
              "enum": [
                "Db not working",
                "Redis not working"
              ]
            }
          }
        }
      }
    }