When will support for fcm http api be discontinued?

This time, I did not receive a separate email because I participated in the Google group.
For this development, I need to implement sending fcm cloud messages, but I am wondering whether to use HTTP API or HTTP V1 API.
However, it cannot be used if the existing HTTP API is discontinued.

Accordingly, please send us accurate information and a link to the official document.

Also, please answer when exactly support will be discontinued and whether PUSH notifications will not go to the app if support is discontinued.

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