Yes. During my final review before the book went into production, I realized I should at least mention the difference between v2 and v3. I didn't want to change the whole section, because some setups still use v2, so I just added a callout explaining how to retrieve keys with etcdctl get --prefix=true. I hope that'll make most readers happy.
It's hard to decide what to put in a book if the technology it's describing is changing so rapidly.
Thanks.
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