Questions about the obsolete send API (Batch send API)

[masafumi.abe]

Hello.

I received an email about "We're writing to remind you that starting June 20, 2024 the legacy Firebase Cloud Messaging (FCM) APIs will be discontinued. " My project is also covered.

> Your recent usage of impacted APIs/features: Admin SDK(batch send API)

The above points are noted.

We are currently using the FCM HTTP v1 API in our project.The following document is implemented in Python with reference code.
https://firebase.google.com/docs/cloud-messaging/send-message?hl=ja#send-messages-to-multiple-devices

Question.
1.Am I correct in thinking that send_multicast(messages), which sends messages to multiple devices, will no longer be available?

2.Am I correct in assuming that the process using send_all(messages) can be used in the future instead?
https://firebase.google.com/docs/cloud-messaging/send-message?hl=ja#send-a-batch-of-messages