Agent:
Added GET /healthz that returns 200 immediately.
File: main.rs (router now includes /healthz).
CI workflow:
Start agent from target/release on both OSes.
Set SOCKTOP_ENABLE_SSL=0 explicitly.
Ubuntu: wait on curl http://127.0.0.1:3000/healthz (60s), log tail and ss/netstat on failure.
Windows: wait on Invoke-WebRequest to /healthz (60s), capture stdout/stderr, print netstat on failure.
File: .github/workflows/ci.yml.
BREAKING: Process list over WS is now Protocol Buffers; client required.
Agent: returns all processes (no server-side top-k); large payloads gzip-compressed.
Client: decodes protobuf (gz/raw), moves sorting/pagination to TUI.
Build: add prost/prost-build with vendored protoc; enable thin LTO, panic=abort, strip symbols.
Cleanup: cfg-gate Linux-only code; fix Clippy across platforms; tests updated (ws probe TLS CA).
Gate Linux-specific imports and fields to avoid Windows dead-code/unused warnings.
Ensure Linux-only proc CPU tracker is not referenced on non-Linux builds.
Here are concise release notes you can paste into your GitHub release.
Release notes — 2025-08-12
Highlights
Agent back to near-zero CPU when idle (request-driven, no background samplers).
Accurate per-process CPU% via /proc deltas; only top-level processes (threads hidden).
TUI: processes pane gets scrollbar, click-to-sort (CPU% or Mem) with indicator, stable total count.
Network panes made taller; disks slightly reduced.
README revamped: rustup prereqs, crates.io install, update/systemd instructions.
Clippy cleanups across agent and client.
Agent
Reverted precompressed caches and background samplers; WebSocket path is request-driven again.
Ensured on-demand gzip for larger replies; no per-request overhead when small.
Processes: switched to refresh_processes_specifics with ProcessRefreshKind::everything().without_tasks() to exclude threads.
Per-process CPU% now computed from /proc jiffies deltas using a small ProcCpuTracker (fixes “always 0%”/scaling issues).
Optional metrics and light caching:
CPU temp and GPU metrics gated by env (SOCKTOP_AGENT_TEMP=0, SOCKTOP_AGENT_GPU=0).
Tiny TTL caches via once_cell to avoid rescanning sensors every tick.
Dependencies: added once_cell = "1.19".
No API changes to WS endpoints.
Client (TUI)
Processes pane:
Scrollbar (mouse wheel, drag; keyboard arrows/PageUp/PageDown/Home/End).
Click header to sort by CPU% or Mem; dot indicator on active column.
Preserves process_count across fast metrics updates to avoid flicker.
UI/theme:
Shared scrollbar colors moved to ui/theme.rs; both CPU and Processes reuse them.
Cached pane rect to fix input handling; removed unused vars.
Layout: network download/upload get more vertical space; disks shrink slightly.
Clippy fixes: derive Default for ProcSortBy; style/import cleanups.
Docs
README: added rustup install steps (with proper shell reload), install via cargo install socktop and cargo install socktop_agent, and a clear Updating section (systemd service steps included).
Features list updated; roadmap marks independent cadences as done.
Upgrade notes
Agent: cargo install socktop_agent --force, then restart your systemd service; if unit changed, systemctl daemon-reload.
TUI: cargo install socktop --force.
Optional envs to trim overhead: SOCKTOP_AGENT_GPU=0, SOCKTOP_AGENT_TEMP=0.
No config or API breaking changes.
Release highlights
Introduced split client/agent architecture with a ratatui-based TUI and a lightweight WebSocket agent.
Added adaptive (idle-aware) sampler: agent samples fast only when clients are connected; sleeps when idle.
Implemented metrics JSON caching for instant ws replies; cold-start does one-off collection.
Port configuration: --port/-p, positional PORT, or SOCKTOP_PORT env (default 3000).
Optional token auth: SOCKTOP_TOKEN on agent, ws://HOST:PORT/ws?token=VALUE in client.
Logging via tracing with RUST_LOG control.
CI workflow (fmt, clippy, build) for Linux and Windows.
Systemd unit example for always-on agent.
TUI features
CPU: overall sparkline + per-core history with trend arrows and color thresholds.
Memory/Swap gauges with humanized labels.
Disks panel with per-device usage and icons.
Network download/upload sparklines (KB/s) with peak tracking.
Top processes table (PID, name, CPU%, mem, mem%).
Header with hostname and CPU temperature indicator.
Agent changes
sysinfo 0.36.1 targeted refresh: refresh_cpu_all, refresh_memory, refresh_processes_specifics(ProcessesToUpdate::All, ProcessRefreshKind::new().with_cpu().with_memory(), true).
WebSocket handler: client counting with wake notifications, cold-start handling, proper Response returns.
Sampler uses MissedTickBehavior::Skip to avoid catch-up bursts.
Docs
README updates: running instructions, port configuration, optional token auth, platform notes, example JSON.
Added socktop-agent.service systemd unit.
Platform notes
Linux (AMD/Intel) supported; tested on AMD, targeting Intel next.
Raspberry Pi supported (availability of temps varies by model).
Windows builds/run; CPU temperature may be unavailable (shows N/A).
Known/next
Roadmap includes configurable refresh interval, TUI filtering/sorting, TLS/WSS, and export to file.
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