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Plot live drive activity every three minutes (#91)

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- Change default collection cadence from 5 minutes to 3 minutes
  (CADENCE_DEFAULT_S=180, systemd OnUnitInactiveSec=3min,
  runit CADENCE=180)
- Update freshness threshold to 450s (2×180 + AccuracySec + 60)
- Add _query_live_graph_data(): queries raw samples from the last
  3 hours and computes interval byte deltas with actual timestamps
- Add LiveActivityGraph widget: vertical bar chart of interval
  volumes with read/write toggle (w key), arrow key inspection,
  and click support
- Wire live graph into TUI layout (full-width row between daily
  graph and drive health), refresh cycle, and CSS grid
- Replace t theme binding with t today/live binding; theme
  selection via preferences file
- Add w binding for read/write toggle on live graph
- Update action legend, help screen, and grid layout for new
  live-activity row
- Add 20 tests covering cadence constants, live query, widget
  rendering, toggle, and TUI integration
- Update all cadence documentation (README, ADR 0003, acceptance
  criteria LC-2, fenris-redesign constants table, CHANGELOG)
This commit is contained in:
xavierk
2026-09-18 13:17:18 +05:30
parent 4f884b4b73
commit e12f4a574c
14 changed files with 735 additions and 70 deletions
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README.md
+2 -2
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@@ -211,7 +211,7 @@ Uninstall performs the sanctioned disable first (`fenris-monitor disable --now`)
## Cadence drop-ins
The default collection cadence is **5 minutes** (`OnUnitInactiveSec=5min` in the timer unit). To change it, place a systemd drop-in:
The default collection cadence is **3 minutes** (`OnUnitInactiveSec=3min` in the timer unit). To change it, place a systemd drop-in:
```bash
sudo systemctl edit fenris-collect.timer
@@ -223,7 +223,7 @@ sudo systemctl edit fenris-collect.timer
No interval key exists in `/etc/fenris/fenris.conf`. Cadence is a systemd concern, not a Fenris configuration key.
On Void, Fenris uses its native runit service instead: its initial collection
is delayed by two minutes and later collections run five minutes after the
is delayed by two minutes and later collections run three minutes after the
previous run finishes. Inspect its state and diagnostics with:
```bash