Provide notification on call when transport is shut down

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This can apply on server-side when the server as a whole is shutting down and also when MAX_CONNECTION_AGE is triggered for a particular transport. It would just be a notification to allow the application to perform a graceful call closure.

It'd also be useful on client-side, especially on mobile (#3688), when connections are being migrated.

There may be concerns of both the client and server reacting at the same time. It should also be noted that in some cases only one side may receive the notification (i.e., when a L7 load balancer is involved).

I don't think any language provides this today. If it is deemed useful, this should be a cross-language feature.

Aucun fichier source ni test n’est nommé. Commencez par examiner l’arrêt du transport Java et les chemins liés à l’ancienneté de la connexion, puis comparez la gestion du cycle de vie côté client et côté serveur ainsi que l’issue mobile associée #3688. La validation nécessite un contrat de notification établi qui tient compte des arrêts simultanés, d’une livraison à sens unique et de la prise en charge multilingue.

Rédigé par le modèle d'indexation à partir du texte de l'issue.