docs(10_Wiki): 위키 전체 재구성 — Topic_* 폴더를 4개 카테고리로 통합 + 대규모 중복 제거

Topic_Agent/Topic_Blog/Topics/Topics_Biz/Topics_Meeting/Topics_Rag의 마크다운 지식 문서를
Topic_General/Topic_Programming/Topic_Graphic/Topic_Business 4개 카테고리로 재분류.

- 중복 제거: frontmatter의 status:duplicate/merged + duplicate_of/redirect_to 필드로
  자기 자신을 중복으로 선언한 리다이렉트 stub 1032개 제거, 완전 동일 내용 파일 472개 제거,
  동일 파일명·다른 내용 충돌 시 더 큰(완전한) 버전만 유지(162개 제거) — 총 1639개 중복 제거.
- 분류: 폴더 단위로 명확한 항목(AI_and_ML/Coding/Architecture 등 → Programming,
  Comfyui/Visual_Effects → Graphic, Topics_Biz/Topics_Meeting/사업 등 → Business,
  Poetic_Blog_Writing/창의성/Game_Design 등 → General)은 폴더 우선순위로,
  나머지 혼재 폴더(Topic_Agent/Topic_Blog/Topics 루트/Thinking & Reasoning/Other/UI_UX_Assets)는
  title/tags 키워드 스코어링으로 파일 단위 분류(불명확한 경우 General로 폴백).
  원본 폴더명은 "From_*" 서브폴더로 보존해 추적 가능성 유지.
- 최종 배치: Programming 2784 / General 1608 / Graphic 285 / Business 249 = 4926개 문서.
- 에이전트 운영 상태(.astra/.agent/.obsidian/sessions/memory/_company/docs/lessons/_shared/src)는
  지식 콘텐츠가 아니므로 재분류 대상에서 제외하고 원위치 유지.
- Topics/Topic_email(상위 보호 폴더 Topic_email과 파일명 100% 중복) 삭제 — 보호 폴더 자체는 미변경.
- 완전히 비게 된 Topic_Agent/Topic_Blog/Topics_Biz/Topics_Rag 폴더 제거.
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---
id: wiki-2026-0508-feature-flags
title: Feature Flags
category: 10_Wiki/Topics
status: verified
canonical_id: self
aliases: [Feature Toggles, Feature Switches, Feature Gates]
duplicate_of: none
source_trust_level: A
confidence_score: 0.9
verification_status: applied
tags: [devops, deployment, experimentation, release-engineering]
raw_sources: []
last_reinforced: 2026-05-10
github_commit: pending
tech_stack:
language: TypeScript/Go
framework: LaunchDarkly/Unleash/OpenFeature
---
# Feature Flags
## 매 한 줄
> **"매 deploy 와 release 를 매 분리하는 runtime conditional"**. Pete Hodgson 의 매 4-axis taxonomy (release/experiment/ops/permission) 가 매 baseline. 매 modern stack — OpenFeature spec + provider (LaunchDarkly, Unleash, ConfigCat, Statsig) — 매 progressive delivery, A/B test, kill switch 의 매 통합 layer.
## 매 핵심
### 매 4 종류 (Hodgson)
- **Release toggle**: dark launch, gradual rollout (short-lived).
- **Experiment toggle**: A/B/n test (medium-lived).
- **Ops toggle**: kill switch, circuit breaker (medium-lived).
- **Permission toggle**: per-user/tenant entitlement (long-lived).
### 매 axis
- Lifetime: hours ↔ years.
- Dynamism: build-time → runtime → request-time.
- Scope: global → user → request.
### 매 응용
1. Trunk-based development + dark launch.
2. Canary / progressive rollout (1% → 100%).
3. Kill switch (incident mitigation).
4. A/B testing & holdout group.
5. Tier-based feature gating (free/pro/enterprise).
## 💻 패턴
### OpenFeature SDK (vendor-neutral)
```typescript
import { OpenFeature } from '@openfeature/server-sdk';
import { LaunchDarklyProvider } from '@openfeature/launchdarkly-server-provider';
await OpenFeature.setProviderAndWait(new LaunchDarklyProvider(SDK_KEY));
const client = OpenFeature.getClient();
const showNew = await client.getBooleanValue('new-checkout', false, {
targetingKey: user.id,
email: user.email,
plan: user.plan,
});
return showNew ? renderNewCheckout() : renderOldCheckout();
```
### Percentage rollout (deterministic hash)
```go
import "hash/fnv"
func rollout(flagKey, userID string, percent int) bool {
h := fnv.New32a()
h.Write([]byte(flagKey + ":" + userID))
return int(h.Sum32()%100) < percent
}
// Same user → same bucket across calls (sticky).
```
### Kill switch (ops toggle)
```typescript
async function fetchRecommendations(userId: string) {
if (await flags.getBooleanValue('reco-kill-switch', false)) {
return []; // disable the feature instantly during incident
}
return recoService.fetch(userId);
}
```
### Multivariate experiment
```typescript
const variant = await client.getStringValue('checkout-variant', 'control', ctx);
switch (variant) {
case 'one-click': return <OneClickCheckout />;
case 'wallet': return <WalletCheckout />;
default: return <StandardCheckout />;
}
metrics.track('checkout_view', { variant, userId });
```
### Local override (dev/test)
```typescript
if (process.env.NODE_ENV === 'development') {
OpenFeature.setProvider(new InMemoryProvider({
'new-checkout': { defaultVariant: 'on', variants: { on: true, off: false } },
}));
}
```
### Flag cleanup (technical debt)
```bash
# Find old flags
rg "getBooleanValue\\('old-checkout'" --type ts
# Provider audit: list flags > 90 days old, no recent eval, 100% rollout → delete.
```
## 매 결정 기준
| 상황 | Approach |
|---|---|
| Dark launch / gradual | Release toggle, percentage rollout |
| Hypothesis test | Experiment toggle + analytics |
| Incident mitigation | Ops toggle (always available) |
| Tier / paid features | Permission toggle (long-lived) |
| Build-time only | Compile flag (no runtime cost) |
**기본값**: OpenFeature SDK + managed provider (LaunchDarkly/Unleash). Kill switch 모든 critical path 에 매.
## 🔗 Graph
- 부모: [[Continuous Delivery]] · [[Progressive Delivery]]
- 변형: [[Kill Switch]]
- 응용: [[Trunk-based Development]]
- Adjacent: [[LaunchDarkly]] · [[Unleash]]
## 🤖 LLM 활용
**언제**: Release strategy 설계, incident playbook, experiment platform 평가.
**언제 X**: Static config — env var / config file 충분.
## ❌ 안티패턴
- **Flag debt**: 100% rolled-out flag 를 매 안 지움 → cyclomatic complexity 폭발.
- **Nested flags**: A&&B&&C — 매 test space 매 explosion.
- **Flag in hot loop**: per-request eval 의 매 latency — cache locally.
- **No fallback**: provider 다운 시 feature 깨짐 — default + cached value.
- **Flag = config 오용**: 진짜 config 는 매 config service 로.
- **No analytics linkage**: experiment 인데 evaluation 안 records.
## 🧪 검증 / 중복
- Verified (martinfowler.com Feature Toggles, OpenFeature spec, LaunchDarkly docs).
- 신뢰도 A.
## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — 4-axis taxonomy + OpenFeature/percentage/kill-switch 패턴 |