This is a HOTFIX patch release to address the following performance and security issues:
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DHIS2-16398: Reduce runtime for expensive subquery in /api/events endpoint
Components: [App] Tracker -
DHIS2-16402: Initiating transaction for cache hits for system settings leads to performance degradation
Components: [API] Other -
It also updates the Struts library to address the recently announced security vulnerability CVE-2023-50164.
See Patch 39.4.0 for the full list of fixes included in the parent patch release.