# v5.1.2
Enhancements


#11124 Release packages for Amazon Linux 2023


#11226 Unify the listener switch to enable, while being compatible with the previous enabled.


#11249 Support HTTP API for setting alarm watermark of license.


#11251 Add /cluster/topology HTTP API endpoint
GET request to the endpoint returns the cluster topology: connections between RLOG core and replicant nodes.


#11253 The Webhook/HTTP bridge has been refactored to its own Erlang application. This allows for more flexibility in the future, and also allows for the bridge to be run as a standalone application.


#11289 Release packages for Debian 12.


#11290 Updated jq dependency to version 0.3.10 which includes oniguruma library update to version 6.9.8 with few minor security fixes.


#11291 Updated RocksDB version to 1.8.0-emqx-1 via ekka update to 0.15.6.


#11236 Improve the speed of clients querying in HTTP API /clients endpoint with default parameters


Bug Fixes


#11065 Avoid logging irrelevant error messages during EMQX shutdown.


#11077 Fixes crash when updating binding with a non-integer port.


#11184 Config value for max_packet_size has a max value of 256MB defined by protocol. This is now enforced and any configuration with a value greater than that will break.


#11192 Fix produces valid HOCON file when atom type is used.

Remove unnecessary " from HOCON file.


#11195 Avoid to create duplicated subscription by HTTP API or client in Stomp gateway


#11206 Make the username and password params of CoAP client to optional in connection mode.


#11208 Fix the issue of abnormal data statistics for LwM2M client.


#11211 Consistently return 404 for DELETE operations on non-existent resources.


#11214 Fix a bug where node configuration may fail to synchronize correctly when joining the cluster.


#11229 Fixed an issue preventing plugins from starting/stopping after changing configuration via emqx ctl conf load.


#11237 The headers default value in /prometheus API should be a map instead of a list.


#11250 Fix while a WebSocket packet contains more than one MQTT packet, the order of MQTT packets will be reversed.


#11271 Ensure that the range of percentage type is from 0% to 100%.


#11272 Fix a typo in the log, when EMQX received an abnormal PUBREL packet, the pubrel was mistakenly typo as pubrec.


#11281 Restored support for the special $queue/ shared subscription.


#11294 Fix emqx_ctl cluster join, leave, and status commands.


#11296 Import additional configurations from EMQX backup file (emqx ctl import command):

rule_engine (previously not imported due to the bug)
topic_metrics (previously not implemented)
slow_subs (previously not implemented).



#11309 Improve startup order of EMQX applications.

Simplify build scripts and improve code reuse.


#11322 Import additional configurations from EMQX backup file (emqx ctl import command):

rule_engine (previously not imported due to the bug)
topic_metrics (previously not implemented)
slow_subs (previously not implemented).