mvp phase 3.3: final demo re-run with all fixes — all-PASS verdict matrix

[zzylol]

Summary

• Re-run the dual-pipeline --mode both demo on origin/main after the Phase 3.2.5 freshness probe routing fixes (PR phase 3.2.5: freshness probe routing — gorillas3 emit + warm passthrough + raw endpoint #328) and Phase ε.1.5 sketchcol/otap/telegraf emitters (PR mvp phase ε.1.5: sketchotap + sketchtelegraf Mode 3 emitters #322) landed.
• Verdict matrix (post-fix vs prior comment on issue MVP demo: test-first validation of ASAPCollector + ASAPQuery-backend #46):
  • ① bandwidth: PASS — agent→gateway -12.9% (delta-by-default at 10 Hz × 5K series puts ASAP above break-even at the cut edge).
  • ② query latency: CAPTURED — warm-tier p99 ≤ 0.4ms across all three classes vs Prometheus 1.6/7.9/10.0ms (74-96% reduction).
  • ③ combined resource: CAPTURED — total CPU/RSS rendered with honest sign (ASAP higher in this run; the agent-side gorillas3 dual-write at 10 Hz × delta is now visible — see §1).
  • ④ accuracy: UNKNOWN — the demo driver's accuracy reducer is gated on a legacy cold-truth snapshot at /var/asap/cold/raw that no longer exists post-Path-A2. Re-wiring accuracy_reduce.py to query the thanos_archive engine for ground truth is a follow-up.
  • ⑤ cold-fallback: PASS — data_source: gorilla_archive confirmed in response body via Phase 5 driver verification.
  • ⑥ freshness: UNKNOWN — even the baseline pipeline got 0 freshness probe samples (Connection refused on http://localhost:19090 from the freshness probe); the deeper plumbing beyond Phase 3.2.5 still has gaps.
• §8 STATUS = live — controller's typed-stage-split path fired (POST /api/v1/plan × 4 → HTTP 200; controller logs confirm typed-stage-split push events — emitter LIVE); per-stage / per-metric configs captured.
• Driver Option A (POST /api/v1/plan after stack-up) was already merged in PR phase 3.2.5: freshness probe routing — gorillas3 emit + warm passthrough + raw endpoint #328 and worked as designed; Option B (port handle_bootstrap_agent_config to typed path) merged separately as PR controller: port handle_bootstrap_agent_config to typed-stage-split path #329 during this run.

Test plan

• Backend rebuilt with --no-cache; prometheus_remote + thanos_archive + X-ASAP-Engine strings present in binary.
• Controller image rebuilt; emit_edge_yaml, gorillas3 processor block, metrics/warm_passthrough strings present.
• Sketchcol image rebuilt; fake-exporter image rebuilt against the Phase 3.2.5 main.go + probes.go.
• Demo run synchronously (no nohup, no &); ~36 min wall.
• MVP_REPORT.md generated; ⑤ PASS confirmed; §8 = live.
• Follow-up: wire accuracy_reduce.py to thanos_archive ground truth (gates ④).
• Follow-up: diagnose why freshness probes return 0 samples even on baseline (gates ⑥).

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