Argus 0.4.0

What's New

Argus v0.4 pivots to a lightweight, zero-dependency JVM monitoring tool — JDK 24+ eliminates virtual thread pinning (JEP 491), so Argus now focuses on general JVM observability.

Flame Graph

• Interactive d3-flamegraph visualization from JFR ExecutionSample data
• 60-second auto-reset window for fresh data
• Pause/Resume to freeze snapshots with timestamp
• Export in collapsed stack format
• Embedded in dashboard JVM Overview tab

CLI Monitor (argus top)

• htop-style terminal UI: CPU, heap, GC, virtual threads, hot methods, contention
• Zero external dependencies — standalone fat JAR (35KB)
• ANSI color coding with green/yellow/red thresholds
• --host, --port, --interval, --no-color options

OTLP Export

• Push-based metrics to OpenTelemetry collectors
• Hand-coded OTLP JSON (no OpenTelemetry SDK dependency)
• 30+ metrics mapped: counters → Sum, gauges → Gauge
• Configure via -Dargus.otlp.* system properties

One-Line Install

curl -fsSL https://raw.githubusercontent.com/rlaope/argus/master/install.sh | bash

Bug Fixes

• Fix d3-flamegraph CDN URL (package: d3-flame-graph)
• Fix demo duration passthrough in Gradle tasks

Downloads

File	Description
argus-agent-0.4.0.jar	Java agent (attach to your app with -javaagent:)
argus-cli-0.4.0-all.jar	Standalone CLI monitor (java -jar argus-cli-0.4.0-all.jar)

Quick Start

# Attach agent
java -javaagent:argus-agent-0.4.0.jar -Dargus.profiling.enabled=true -jar your-app.jar

# Open dashboard
open http://localhost:9202/

# Or use CLI
java -jar argus-cli-0.4.0-all.jar

Full Changelog: v0.3.0...v0.4.0

What's Changed

• feat: separate dashboard into Virtual Threads and JVM Overview tabs by @rlaope in #22
• feat: Argus v0.4 - Flame Graph, CLI Monitor, OTLP Export by @rlaope in #23

Full Changelog: v0.3.1...v0.4.0