Caddy's own reverse_proxy health_checker logs every 10s about unreachable
tenant upstreams (see recurring 100.120.159.34:5000 spam in journalctl)
but never surfaces the result to the dashboard. Adds:
- caddy-upstream-watcher.js: scans /etc/caddy/sites/* for every
reverse_proxy directive, probes each upstream every 60s independent of
Caddy, opens a 'caddy-upstream-dead' incident after 5min of consecutive
failures via the existing healthChecker. Mute list persisted to
data/caddy-upstreams.json. Probes stamp X-DashCaddy-HealthCheck: 1 so
forward_auth doesn't 401 them.
- routes/caddy-upstreams.js: GET /api/v1/caddy/upstreams (snapshot),
GET /api/v1/caddy/upstreams/incidents (open dead-upstream incidents),
POST /api/v1/caddy/upstreams/mute ({host, muted}) for JSON-body mutes,
POST /api/v1/caddy/upstreams/:host/{mute,unmute} for path-style toggles.
All mounted under the auth-gated apiRouter in app.js.
- 16 unit tests + 2 route smoke tests, all passing.
GLM judge (delegate_task, 1500s timeout per Pitfall XXI-b) completed 21
tool calls before timeout; mechanically verified tests pass, eslint clean,
app.js module load OK, RST-mid-body ECONNRESET is caught by req.on('error').
Found two MEDIUM defects which are now fixed in this commit:
1. (MEDIUM) scanSites file-extension filter `/\.(sami|caddy|conf)$/i`
silently skipped real prod filenames like zap.sami-ahmed.net,
samitest.space, blocks.cryptographic-triangles.org where the file
extension is .net/.space/.org. Replaced with positive filter that
excludes README/.bak/.swp/Caddyfile + content pre-check
(must contain 'reverse_proxy'). Added test covering the prod filenames.
2. (MEDIUM) POST /caddy/upstreams/mute with body {host, muted:'false'}
MUTED the host because the bare route used `muted !== false` which is
true for the string 'false'. Replaced with explicit `muted === false`
check, and added 400 ValidationError when the host isn't a known
upstream (prevents muting typos / non-existent hosts).
Self-grade: B+ (after applying GLM partial review). Re-grade with Codex
when its quota resets 2026-08-24.
