You should perform which three options when troubleshooting a Cisco Unified CCX engine "Java out...

Heap dumps are snapshots of the Java heap memory that contain information about the objects and classes in the heap at the moment of the dump. Heap dumps can help you identify memory leaks, excessive memory consumption, and other memory-related issues. You can collect heap dumps using the Cisco Unified Real-Time Monitoring Tool (RTMT), which is a client application that allows you to monitor and troubleshoot Cisco Unified CCX components. To collect heap dumps, you need to enable the HeapDumpEnabled service parameter and configure theHeapDumpSchedule parameter. You can then use the RTMT to view and download the heap dumps from the Cisco Unified CCX server2.

Collect engine heap performance data via the Cisco Unified Real-Time Monitoring Tool. In addition to heap dumps, you can also collect engine heap performance data using the RTMT. This data includes metrics such as heap usage, heap size, garbage collection time, and garbage collection frequency. You can use the RTMT to monitor these metrics in real time or generate historical reports. You can also set alerts and thresholds for these metrics to receive notifications when they exceed the specified values. Collecting engine heap performance data can help you analyze the memory behavior and performance of the Cisco Unified CCX engine3.

References: 1: Cisco Unified Contact Center Express Serviceability Administration Guide, Release 12.5(1) - Control Center [Cisco Unified Contact Center Express] - Cisco 2: Cisco Unified Contact Center ExpressAdministration and Operations Guide, Release 12.5(1) - Troubleshoot Unified CCX [Cisco Unified Contact Center Express] - Cisco 3: Cisco Unified Contact Center Express Administration and Operations Guide, Release 12.5(1) - Monitor Unified CCX [Cisco Unified Contact Center Express] - Cisco