Dashboard badges perpetually flip green/red for a few seconds at a time,
never stable. Root cause: health-checker emitted 'status-check' on every
probe (every 30s) and dashboard-ws forwarded every one as 'status-change'
to the browser with no diff; live-events.js then unconditionally called
setBadge(). A single transient 5xx (Caddy reload, container restart, TLS
handshake blip) flipped the badge and the next green probe flipped back.
Fix: _computeDisplayedStatus applies asymmetric hysteresis — DOWN_THRESHOLD
(default 2, env-tunable HEALTH_DOWN_THRESHOLD) consecutive probes that
disagree with the displayed 'up' state flip to red; UP_THRESHOLD (default
1, HEALTH_UP_THRESHOLD) flips back to green. History and consecutiveFailures
still record every raw probe so postmortem analysis is unchanged. Only the
SSE broadcast is filtered. getCurrentStatus now returns the displayed
status so a page reload shows the same badge as the live stream.
10 new tests cover first-emit, same-status-dedup, the actual flicker bug
(one-down-then-up keeps green), two-down flips red, one-up recovers fast,
long-steady-green produces exactly one emit, and env-var tuning. All 63
existing health-checker tests still pass. Full suite: 2484/2484.
Hermes
be021588c7