Argus 0.3.0

New Features

Phase 3: GC Deep Dive

• Allocation Rate Tracking - Track object allocations with configurable threshold
• Metaspace Monitoring - Monitor class metadata memory usage
• GC Overhead Calculation - Calculate GC time as percentage of total time

Phase 4: CPU/Thread Deep Dive

• Method Profiling - Identify hot methods with execution sampling (Top 20)
• Lock Contention Tracking - Detect synchronization bottlenecks

Phase 5: Correlation Analysis

• GC ↔ CPU Correlation - Detect CPU spikes around GC events
• GC ↔ Pinning Correlation - Identify pinning increases during GC
• Automatic Recommendations - Actionable insights for:
  • GC overhead warnings (>10%)
  • Memory leak detection
  • Lock contention hotspots
  • High allocation rate warnings
  • Metaspace growth warnings

New Configuration Options

Property	Default	Description
argus.allocation.enabled	false	Enable allocation tracking (high overhead)
argus.allocation.threshold	1048576	Minimum allocation size to track (1MB)
argus.metaspace.enabled	true	Enable metaspace monitoring
argus.profiling.enabled	false	Enable method profiling (high overhead)
argus.profiling.interval	20	Profiling sampling interval (ms)
argus.contention.enabled	false	Enable lock contention tracking
argus.contention.threshold	50	Minimum contention duration to track (ms)
argus.correlation.enabled	true	Enable correlation analysis

New API Endpoints

• /allocation-analysis - Allocation rate and top allocating classes
• /metaspace-metrics - Metaspace usage statistics
• /method-profiling - Hot methods analysis
• /contention-analysis - Lock contention hotspots
• /correlation - Correlation analysis and recommendations

Usage

Production (Safe Defaults)

java -javaagent:argus-agent-0.3.0.jar \
     -Dargus.server.enabled=true \
     --enable-preview \
     -jar your-app.jar

Full Profiling (Development/Testing)

java -javaagent:argus-agent-0.3.0.jar \
     -Dargus.server.enabled=true \
     -Dargus.allocation.enabled=true \
     -Dargus.profiling.enabled=true \
     -Dargus.contention.enabled=true \
     --enable-preview \
     -jar your-app.jar

Breaking Changes

None

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Full Changelog: v0.2.0...v0.3.0

What's Changed

• feat: Enhanced Pinning Analysis with Stack Trace Grouping by @rlaope in #18
• feat: add event export functionality by @rlaope in #19
• feat: add Memory/GC and CPU monitoring by @rlaope in #20
• feat: add advanced profiling and correlation analysis (Phase 3-5) by @rlaope in #21

Full Changelog: v0.2.0...v0.3.0