Haproxy 2.4 dev17 does not have server attribute in resolvers section

We want to use dns discover for more than 1000 backends, using udp resolver takes a lot of cpu. I tried the 2.4dev12 branch and the server key in resolver section solves most of the issue, but same server keyword does not work with 2.4dev17 branch. Is it removed?

The document has it though HAProxy version 2.4-dev10 - Configuration Manual

resolvers mydns
    server dns1
    accepted_payload_size 8192 # allow larger DNS payloads
    hold valid 10s

Read doc/configuration.txt from the tarball or the git snapshot.

You can’t read outdated documentation when you are running development builds.

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