Is there any solution other than managed federation for not restarting the server?

IF there is solution how to achieve that continuous pooling

Sounds like you might be interested in this thread: https://community.apollographql.com/t/feedback-thread-future-deprecation-of-servicelist-in-apollogateway

It didnt help me to find solution.
'The problem statement : “Is there any alternative than managed federation where apollo gateway continous polls for schema from uplink”. How can one manually configure to get schema from different link (same link uplink).