AppDynamics is removing the Legacy Async capability in the Java Agent for APM.
The Legacy Async feature was built to support correlation in asynchronous Business Transactions. In v3.6, an improved approach was introduced, and the old implementation was retained as the ‘Legacy Async’ feature. This new async approach has been the default approach after v3.6.
This change is effective on Jun 14, 2017, 12 months from the date of this notice, or after the release of v4.4, whichever is later.
All customers using the Java Agent for APM are affected. Once the feature is removed, users will no longer be able to disable the new async metric support to switch to the legacy async metrics support (see figure below for more details). Customers using a pre-3.6 Java Agent should upgrade it to newer versions.