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Document a strong recommendation that MaxStartups be increased in their sshd config and sshd should be restarted before doing an SCP Individual restore of a sharded cluster (or when doing multiple restores at the same time). MaxStartups should be set to (#of shards + # of config server)*4 + 10. The "10" is just a buffer for other connections.
This is probably the best place for it: https://docs.cloud.mongodb.com/tutorial/restore-replica-set/.
Background: sshd's default configuration starts dropping connections after 10 connections. In the worst case, an SCP restore requires 4 connections per shard and config server.
daniel.gottlieb discovered this in CLOUDP-14319
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