22 Upgrade notes for 7.0.11

Asynchronous DNS resolution

The agent poller and SNMP poller can now be configured to use the c-ares library (version 1.16.0 or newer) instead of the libevent DNS resolver, providing potentially faster and more flexible DNS resolution.

If you want to use c-ares library, configure Zabbix with the --with-ares option:

  --with-ares[=ARG]       use c-ares library [default=no],
         --with-ares-include=DIR use c-ares include headers from given path.
         --with-ares-lib=DIR     use c-ares libraries from given path.

Note that starting from c-ares 1.31.0, DNS caching is enabled by default.