Release 3.9.0

Release 3.9.0

* [CritFix] Protect regexp matcher from regexps with empty patterns
* [Feature] Allow adding X-CMAE-Score header
* [Feature] Allow custom milter quarantine and tempfail messages
* [Feature] Allow to specify minimum weight in GPT plugin
* [Feature] Cloudmark: Add scores_symbols setting
* [Feature] Further optimization to the hot path
* [Feature] Make min_resolve_interval configurable
* [Feature] Report slow synchronous rules
* [Feature] Rspamc: add `files-list` option
* [Feature] Support metrics command in normal/proxy workers
* [Feature] Support reply in message pack format
* [Feature] Use msgpack in the client
* [Feature] Verify sanity of l= tag in DKIM
* [Feature] milter_headers: support not removing headers
* [Fix] Allow autolearn for the controller worker
* [Fix] Allow spaces in DMARC records
* [Fix] Allow to set 0 as number of rows to disable roll history
* [Fix] Always set the unlearn flag when relearning
* [Fix] Apply detection phase if fasttext could not detect language
* [Fix] Backport fixes from libucl
* [Fix] Backport multiple fixes from libucl
* [Fix] Change expiration logic for redis_cache
* [Fix] Check nconns when firing the final termination event
* [Fix] Do not apply tableshape for known senders
* [Fix] Do not crash if symbol is missing in the metric
* [Fix] Do not read out-of-boundary when doing base64 encoding
* [Fix] Do not save multipatterns to FS in certain cases
* [Fix] Fix another corner case that allows candidates to be freed without init
* [Fix] Fix documentation nesting
* [Fix] Fix dynamic_symbols in the multimap plugin
* [Fix] Fix inconsistent nesting in mime parts
* [Fix] Fix parsing of maps definitions
* [Fix] Fix shared memory proxying when compression is set
* [Fix] Fuzzy add/delete handlers are badly broken for compression
* [Fix] Honor dynamic thresholds for greylisting module
* [Fix] If we have one statfile disabled we need to disable all
* [Fix] Increase/decrease hash_key value for tokens depending on is_unlearn
* [Fix] Libucl: Fix messagepack autodetection
* [Fix] Resgore the collaterally removed line
* [Fix] Unset autolearn flag if we learn explicitly
* [Fix] Update `nconns` in proxy
* [Fix] Update greylisting threshold as it can be easily dynamic
* [Fix] Update is_spam in learned_ids when relearning
* [Fix] Use explicit timeouts in the metadata exporter
* [Fix] metric_exporter: avoid sending `nil` in metric values
* [Project] Add GPT plugin
* [Project] Add a tool to perform statistical analysis of classifiers
* [Project] Finally fix slow timer behaviour
* [Project] Implement fuzzy check retransmits backpressure
* [Project] Improve stats processing
* [Project] Reduce default window size of OSB tokenizer to 2
* [Project] Rework grow factor
* [Project] Start optimization of userdata hashing
* [Project] Use libarchive for troublesome archives
* [Rework] Allow metrics endpoint to be enabled for each scanner
* [Rework] Allow multiple conditions for dkim signing when using vault/redis
* [Rework] Introduce dynamic_rate_limit for ratelimits
* [Rework] Serialize control commands
* [Rework] Update fmt to version 11
* [Rework] Use direct hashing instead of string hashing
* [Rules] Added rules for detecting likely malware