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-sre
title: SRE
category: 10_Wiki/Topics
status: verified
canonical_id: self
aliases: [Site Reliability Engineering, production engineering]
duplicate_of: none
source_trust_level: A
confidence_score: 0.95
verification_status: applied
tags: [sre, reliability, slo, observability, devops]
raw_sources: []
last_reinforced: 2026-05-10
github_commit: pending
tech_stack:
language: multi
framework: prometheus-grafana-opentelemetry
---
# SRE
## 매 한 줄
> **"매 reliability 의 feature 의 — 매 first feature 의"**. SRE (Site Reliability Engineering) 의 Google-originated discipline 의 software engineering 의 ops 의 applying. 핵심: SLOs 의 define, error budgets 의 enforce, toil 의 eliminate, blameless postmortems.
## 매 핵심
### 매 SRE 의 핵심 의 concepts
- **SLI**: 매 measurement (e.g., 200-OK rate over 5min).
- **SLO**: 매 target (e.g., 99.9% over 28d rolling).
- **SLA**: 매 customer contract (with $ penalty).
- **Error budget**: 매 100% - SLO. 매 budget 의 burn 시 release freeze.
### 매 four golden signals (Google)
- Latency, Traffic, Errors, Saturation.
### 매 응용
1. SLO-driven alerting (multi-window burn rate).
2. Toil budget (≤50% of SRE time).
3. Blameless postmortem culture.
## 💻 패턴
### Prometheus SLO recording rules
```yaml
groups:
- name: slo.rules
interval: 30s
rules:
- record: api:availability:ratio_rate5m
expr: |
sum(rate(http_requests_total{job="api",code!~"5.."}[5m]))
/ sum(rate(http_requests_total{job="api"}[5m]))
- record: api:availability:ratio_rate1h
expr: |
sum(rate(http_requests_total{job="api",code!~"5.."}[1h]))
/ sum(rate(http_requests_total{job="api"}[1h]))
```
### Multi-window multi-burn-rate alert
```yaml
- alert: ApiErrorBudgetFastBurn
expr: |
(1 - api:availability:ratio_rate5m) > (14.4 * 0.001)
and
(1 - api:availability:ratio_rate1h) > (14.4 * 0.001)
for: 2m
labels: { severity: page }
annotations:
summary: "Fast burn — 매 2% budget 의 1h 의 consume 의"
```
### OpenTelemetry instrumentation (Node)
```typescript
import { NodeSDK } from '@opentelemetry/sdk-node';
import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http';
import { getNodeAutoInstrumentations } from '@opentelemetry/auto-instrumentations-node';
new NodeSDK({
traceExporter: new OTLPTraceExporter({ url: process.env.OTEL_ENDPOINT }),
instrumentations: [getNodeAutoInstrumentations()],
}).start();
```
### Runbook automation (Python)
```python
import kubernetes.client as k8s
def remediate(pod_name: str, ns: str):
api = k8s.CoreV1Api()
api.delete_namespaced_pod(pod_name, ns)
notify_slack(f"매 auto-restart {ns}/{pod_name} (high mem)")
```
### Postmortem template
```markdown
# Incident YYYY-MM-DD: <title>
**Status**: resolved
**Impact**: <users affected, $ lost, duration>
**Severity**: SEV-2
## Timeline (UTC)
- 14:02 alert fired
- 14:05 oncall paged
- 14:18 root cause identified
- 14:31 mitigated
## Root Cause
<technical>
## Action Items
- [ ] (P0) Fix race in checkout-svc — owner: @x
- [ ] (P1) Add SLO alert for queue depth — owner: @y
```
### Toil tracking
```typescript
type Toil = { repetitive: boolean; manual: boolean; automatable: boolean; ts: Date };
// dashboard: toil hours / total hours per quarter, target ≤50%
```
## 매 결정 기준
| 상황 | SLO |
|---|---|
| user-facing read API | 99.9% availability, p99 <300ms |
| user-facing write API | 99.95% availability, p99 <500ms |
| internal batch | 99.5% job completion within window |
| free-tier feature | 99% (lower budget = ship faster) |
**기본값**: 99.9% availability, multi-burn-rate alerts, weekly error-budget review.
## 🔗 Graph
- 부모: [[DevOps]] · [[Production Engineering]]
- 변형: [[Platform Engineering]] · [[CI/CD Pipeline & IDE Security Integration|DevSecOps]]
- 응용: [[Observability]] · [[Chaos Engineering]]
- Adjacent: [[Prometheus]] · [[OpenTelemetry]]
## 🤖 LLM 활용
**언제**: postmortem drafting from timeline, log anomaly summarization, runbook generation, oncall question answering.
**언제 X**: auto-remediation 의 LLM-only — 매 hallucinated kubectl 의 prod 의 destroy.
## ❌ 안티패턴
- **No SLO**: 매 alert noise — 매 every blip 의 page.
- **100% uptime goal**: 매 unattainable, 매 budget 0 = no innovation.
- **Blame culture**: postmortem 의 finger-pointing — engineers 의 hide incidents.
- **Toil unbounded**: SREs 의 burned out — quit within 12mo.
## 🧪 검증 / 중복
- Verified (Google SRE Book, SRE Workbook, Prometheus docs, Sloth SLO generator).
- 신뢰도 A.
## 🕓 Changelog
| 날짜 | 변경 |
|---|---|
| 2026-05-08 | Phase 1 |
| 2026-05-10 | Manual cleanup — SLO + burn-rate + OTel patterns |