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wiki/concepts/Canary-Release.md

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+---
+title: "Canary Release"
+type: concept
+tags: [devops, deployment, release-management, automation]
+date: 2025-03-01
+---
+
+## Definition
+
+金丝雀发布（Canary Release）是一种渐进式软件发布策略，将新版本首先部署给小部分用户，验证稳定性后再逐步扩大范围，最终替换全部用户。这种策略降低了全量发布风险，实现近乎零干扰的发布。
+
+## How It Works
+
+```
+Phase 1: 5% Traffic     Phase 2: 20% Traffic    Phase 3: 100% Traffic
+┌─────────────────┐    ┌─────────────────┐     ┌─────────────────┐
+│ New Version     │    │ New Version     │     │ Old Version     │
+│    ██          │    │      ████      │     │     ░░░░       │
+│ 5% users        │    │ 20% users       │     │  Rollback if   │
+└─────────────────┘    └─────────────────┘     │  issues         │
+     ↓                      ↓                  └─────────────────┘
+  Monitor metrics      Monitor + Auto-rollback       ↓
+  Auto-promote        if failure rate ↑         Full Deployment
+```
+
+## Key Metrics to Monitor
+
+| 指标 | 描述 | 告警阈值 |
+|------|------|---------|
+| Error Rate | 错误率变化 | +2% |
+| Latency | 响应时间 | +50ms |
+| Business KPIs | 转化率、订单量 | -5% |
+| Resource Usage | CPU/内存 | +30% |
+
+## In ITSM Context
+
+在[[ITSM 2.0]]的[[Release-Management]]中，金丝雀发布是关键实践：
+
+```
+Release Management 2.0
+├── Canary Release
+│   ├── 渐进式流量转移
+│   ├── 实时监控
+│   └── 自动回滚
+├── Blue-Green Deployment
+│   ├── 零停机切换
+│   └── 快速回滚
+└── Feature Flags
+    ├── 精细化控制
+    └── A/B Testing
+```
+
+## Related Concepts
+
+- [[Release-Management]] — 发布管理总框架
+- [[Blue-Green-Deployment]] — 蓝绿部署
+- [[Feature-Flag]] — 特性开关
+- [[Progressive-Rollout]] — 渐进式发布
+- [[Deployment-Automation]] — 部署自动化
+
+## Sources
+
+- [[understanding-complete-itsm]] — Canary Release在现代ITSM中的应用