Checkpoint 6.5: the check strip

One cell per committed check, plus dashed gap cells for slots with no evidence — a paused window renders as a hole, never interpolated green.

at a glance

Goal: An at-a-glance evidence timeline per monitor — not a vibe, a picture of what was actually observed.
Built: CheckStrip: one cell per committed check colored by outcome (pass=green, failing=red, missed/unknown=grey) plus dashed gap cells for slot-grid positions with no evidence.
Result: the pause-gap spec pauses a monitor mid-run over real scheduled slots; the resumed strip shows the hole exactly where evidence is absent
Code: akira-shirase-oss/monitoring-service · main @ 686c430

Fifth slice — the first visualization.

Gap: checks rendered as rows; there was no at-a-glance timeline.

What changed: CheckStrip sits above the detail page’s check rows — one cell per committed check, colored by outcome (pass=green, failing=red, missed/unknown=grey), plus dashed gap cells for slot-grid positions with no evidence. Missing observations render as holes, never interpolated green — the strip is an evidence visualization, not a vibe. The cell model is a pure TypeScript function so the DOM mapping is the only thing the browser test has to believe.

Proof: the pause-gap spec pauses a monitor mid-run over real scheduled slots, resumes it, and asserts the strip shows a gap cell exactly where evidence is absent — a hole in the data renders as a hole in the picture.