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hash_salt_path
parameter is for security.Here is a use cases.
Use case: Don't version control hash salt.
If we version control fluentd.conf, hash salt is also version controlled
because we need to write hash salt by
hash_salt
parameter influentd.conf.
We can use random hash salt for each host by
hash_salt_path
parameterwithout version controlling hash salt. Because
hash_salt_path
generatesrandom hash salt key and saves it when the path doesn't exist.