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Reported in https://forum.sympl.host/t/tempfile-is-deprecated-messages/245

Cron weekly (and likely others) report WARNING: tempfile is deprecated; consider using mktemp instead. when running the jobs.

On investigation, tempfile is used in:

core/lib/symbiosis/config_file.rb
core/test.d/tc_utils.rb
core/test.d/tc_config_file.rb
dns/lib/symbiosis/config_files/tinydns.rb
firewall/sbin/sympl-firewall-blacklist
firewall/sbin/sympl-firewall-whitelist
firewall/sbin/sympl-firewall
firewall/test.d/tc_blacklistdb.r
ftp/test.d/tc_ftp.rb
mail/sympl/test.d/tc_poppassd.rb
mail/sympl/test.d/tc_dict_handler.rb
web/lib/symbiosis/config_files/apache.rb
web/lib/symbiosis/config_files/webalizer.rb
web/test.d/tc_apache_logger.rb
web/test.d/tb_sympl_web_configure.rb

More investigation is probably needed as it looks to be originating with the ruby tempfile.rb library.