A number of non-working configuration options that had been marked as obsolete in previous releases have now been removed completely. Using any of the following options is now considered a configuration failure:

• acache-cleaning-interval
• acache-enable
• additional-from-auth
• additional-from-cache
• allow-v6-synthesis
• cleaning-interval
• dnssec-enable
• dnssec-lookaside
• filter-aaaa
• filter-aaaa-on-v4
• filter-aaaa-on-v6
• geoip-use-ecs
• lwres
• max-acache-size
• nosit-udp-size
• queryport-pool-ports
• queryport-pool-updateinterval
• request-sit
• sit-secret
• support-ixfr
• use-queryport-pool
• use-ixfr.

GL #1086

This should have own actor checking for those deprecated options and disable them in configuration if found there. They would become fatal errors.