---
title: "Control Chart"
url: "https://radix.wiki/contents/tech/operations/control-chart"
version: "2.0.0"
updated: 2026-08-17
last_verified: 2026-08-17
license: CC-BY-4.0
license_url: "https://creativecommons.org/licenses/by/4.0/"
---

# Control Chart

|  |  |
| --- | --- |
| **System** | DMAIC Agent Cluster (retired) |
| **Ran** | 1–5 April 2026 |
| **Retired** | 27 June 2026 |
| **Metrics Under SPC** | 7 |
| **Baseline Period** | 14 days (reached day 8) |
| **Collection Cadence** | Daily 6 AM UTC, via `/api/metrics` |
| **Outcome** | Control limits were never computed |

## Overview

**This page is a closed record.** The agent cluster it describes was [retired on 27 June 2026](https://github.com/tutmoses/radix-wiki/commit/895228bf806a5a69ecfdfd82dbe703d46f099482), when the nine cron-driven API routes that ran it — including `/api/metrics`, the daily collector named below — were deleted and the repository's `vercel.json` cron declaration was dropped. Wiki maintenance now runs on demand rather than on a schedule; the current record of that work is the [Wiki Maintenance Log](/contents/tech/operations/wiki-maintenance-log). Everything below is preserved as measured, and stops at the pipeline's last snapshot on 5 April 2026.

This page tracked statistical process control (SPC) metrics for the wiki's autonomous agent cluster. A daily `/api/metrics` cron wrote one snapshot per day at 06:00 UTC and a `wiki-spc` task analysed the series with Western Electric rules. The first fourteen days were to establish baselines, after which a 2σ deviation raised a yellow warning and 3σ a red — triggering an agent and a Telegram alert.

Collection stopped at day 8. **The control limits were never computed**, so no rule ever fired and no alert was ever raised. The eight daily snapshots below are the complete series.

## Control Limits (never computed)

_Baseline collection reached day 8 of 14 and stopped. Computing limits needed fourteen snapshots, so every cell below stayed empty for the life of the system._

| Metric | Mean | σ | 2σ Limit | 3σ Limit | Direction |
| --- | --- | --- | --- | --- | --- |
| content_quality_score | – | – | – | – | Alert on decrease |
| agent_error_rate_7d | – | – | – | – | Alert on increase |
| tweet_queue_depth | – | – | – | – | Alert on increase |
| coverage_gap_count | – | – | – | – | Alert on increase |
| distribution_velocity | – | – | – | – | Alert on decrease |
| tweets_expired_7d | – | – | – | – | Alert on increase |
| stale_pages_30d | – | – | – | – | Alert on increase |

## Alerts

_None were ever raised — escalation depended on control limits that were never computed._

**Pre-SPC observations (from weekly retro 2026-04-05):**

- Pulse health at 0.0% all week – will bias health_score baseline downward
- Tweet pipeline offline – distribution_velocity baseline will be artificially low
- Moltbook errors increasing (2→6/day) – error_rate baseline may capture an upward trend

## 7-Day Trend

_The complete series. Written weekly by `wiki-retro`; the last row is the last snapshot the pipeline produced._

| Date | Quality | Health | Velocity | Error Rate | Status |
| --- | --- | --- | --- | --- | --- |
| 2026-04-01 | 0.757 | 0.685 | 2 | – | Baseline day 1 |
| 2026-04-02 | 0.757 | 0.687 | 3 | 3.4% | Baseline day 3 |
| 2026-04-03 | 0.797 | 0.687 | 2 | 3.2% | Baseline day 4 |
| 2026-04-04 | 0.797 | 0.684 | 2 | 4.0% | Baseline day 6 |
| 2026-04-05 | 0.797 | 0.683 | 2 | 4.2% | Baseline day 8 |

## Feedback Loops

- **Loop 1 – Content Quality:** Sentinel → Mender → quality score trend → early Sentinel trigger on decline
- **Loop 2 – Tweet Performance:** Herald → post → engagement data → tweet-feedback.json → Herald bias
- **Loop 3 – Agent Reliability:** All agents → error rate → Pulse deep mode on Red
- **Loop 4 – Coverage Gaps:** Scout flags → gap count trend → escalation to daily plan
- **Loop 5 – Distribution Reach:** Velocity trend → weekly retro → diversification rules

All five loops depended on the cron-driven routes deleted in [commit 895228b](https://github.com/tutmoses/radix-wiki/commit/895228bf806a5a69ecfdfd82dbe703d46f099482); none of the named agents runs today.

## External Links

- [Commit 895228b — "Remove retired agent-cluster routes" (27 June 2026)](https://github.com/tutmoses/radix-wiki/commit/895228bf806a5a69ecfdfd82dbe703d46f099482)
- [radix-wiki source repository](https://github.com/tutmoses/radix-wiki)
- [Improvement Log](/contents/tech/operations/improvement-log) — the retrospective half of the same retired system
- [Wiki Maintenance Log](/contents/tech/operations/wiki-maintenance-log) — the current, on-demand maintenance record