v4.3.22

Enhancements

Support to use placeholders like ${var} in the HTTP Headers of rule-engine's Webhook actions #9239.
Asynchronously refresh the resources and rules during emqx boot-up #9199. This is to avoid slowing down the boot if some resources spend long time establishing the connection.
Add a warning log if the ACL check failed for subscription #9124. This is to make the ACL deny logging for subscription behave the same as for publish.
JWT ACL claim supports all action to imply the rules applie to both pub and sub #9044.

Fix that after uploading a backup file with an UTF8 filename, HTTP API GET /data/export fails with status code 500 #9224.
Improve the display of rule's 'Maximum Speed' counter to only reserve 2 decimal places #9185. This is to avoid displaying floats like 0.30000000000000004 on the dashboard.
Fix the issue that emqx prints too many error logs when connecting to mongodb but auth failed #9184.
Fix that after receiving publish in idle mode the emqx-sn gateway may panic #9024.
"Pause due to rate limit" log level demoted from warning to notice #9134.
Restore old emqx_auth_jwt module API, so the hook callback functions registered in older version will not be invalidated after hot-upgrade #9144.
Fixed the response status code for the /status endpoint #9210. Before the fix, it always returned 200 even if the EMQX application was not running. Now it returns 503 in that case.
Fix message delivery related event encoding #9226 For rule-engine's input events like $events/message_delivered, and $events/message_dropped, if the message was delivered to a shared-subscription, the encoding (to JSON) of the event will fail. Affected versions: v4.3.21, v4.4.10, e4.3.16 and e4.4.10.