Improvements
Change to default setting for ActiveRecord connection resolution
Due to incompatibilities between the faster ActiveRecord connection resolution released in Ruby agent v6.3.0 and other gems that patch ActiveRecord, backport_fast_active_record_connection_lookup will now be set to false by default. This will result in significant performance improvement.
Recommendation: If your environment includes ActiveRecord, change this setting to true.
Exception: If you are using other gems that measure ActiveRecord performance, they may lose functionality when combined with this setting. If you are unsure whether to enable backport_fast_active_record_connection_lookup, we recommend enabling it in a development environment to make sure other gems that patch ActiveRecord are still working as expected.
Fixes
Bugfix for ActiveStorage instrumentation error
Version 6.4.0 of the agent introduced a bug that interfered with ActiveStorage callbacks, resulting in the agent being unable to instrument ActiveStorage operations. ActiveStorage segments are now correctly recorded.
Bugfix for ActiveRecord 4.1 and 4.2 exception logging
Version 6.3.0 of the agent introduced a bug that prevented ActiveRecord versions 4.1 and 4.2 from logging exceptions that occurred within a database transaction. This version of the agent restores the exception logging functionality from previous agent versions. Thanks to Oleksiy Kovyrin for the contribution!
Notes
The Ruby agent now enforces a maximum of 10,000 transaction events and custom events and 100 error events per minute.