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server restart notification [with timer] so a pool can attempt a graceful restart rather than suddenly dropping connections.
What's the use case for this? If I want to restart the server I can do it without such command as it doesn't require any action from the miner side.
Maybe I can add "wait" option to existing client.reconnect() instead?
The thinking is for when a pool is doing some kind of maintenance (either to update their code/settings, or reboot the machine). It's "good manners" for the pool to notify the miner in ADVANCE, that way they can move to a fallback pool/server before suddenly losing connection. A "retry/wait" time should also be included in the restart method, so the miner knows how long it should wait before trying to reconnect.
