QML Connections: Implicitly defined onFoo properties in Connections are deprecated

in Qml 5.15 there is a new syntax for connections. In your case it would look like this:

Connections {
    target: AppProxy

    function onLogsReady(logs) {
        textLogs.text = logs
    }
}

You can read more about it here: https://doc.qt.io/qt-5/qml-qtqml-connections.html