Closes the v0.1 observability gap. Eleven new metrics in the
dragonfork_webrtc_* namespace (RED-method on the WHEP surface plus
state gauges from the WebRTC subsystem), Prom + Grafana containers
added to deploy/truenas/core/, four pre-loaded alert rules, one
pre-provisioned dashboard.
Hybrid instrumentation: direct client_golang in app/webrtc/ for
hot-path counters and histograms; snapshot collector in
prometheus/webrtc.go for slow-changing gauges. Rationale and
trade-offs against the upstream monitor/metric bus pattern documented
in the Approach section.
Targets v0.2.0-dragonfork.
M2 promotes the M1 standalone PoC into the datarhei Core binary so
WebRTC becomes a first-class output alongside RTMP/SRT/HLS, surfaced
in the core-ui dashboard.
Architecture: new app/webrtc sibling subsystem + two small hooks on
restream (ProcessHooks + AppendOutput), reusing the untouched M1
core/webrtc package. WHEP served under /api/v3/process/{id}/whep,
inheriting JWT auth. A new "Live (WebRTC)" tab on the process detail
view provides the embedded browser player.
Covers: purpose, architecture diagram, decision table, components,
data flow (enable/subscribe/stop/disable/restart), error handling,
testing strategy (unit/integration/e2e), acceptance criteria,
rollback, and a seven-milestone sanity breakdown.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
