Why there is a delay when sending push notifications to Google Android?

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Good day,
A few days ago faced a problem - when sending push notifications to android applications from the server face a delay in receiving a response from the server. Before that several years with the problem faced.
Make all Doc https://developers.google.com/cloud-messaging/

Maybe the problem is somehow connected with Roskomnadzor?
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Mine found the answer to your question: https://androidinsider.ru/os/roskomnadzor-slomal-p...
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