Sync: add ec2 optimization notes

wiki/log.md

@@ -1,3 +1,14 @@
+## [2026-04-24] ingest | Public Cloud Learning Sessions - Best practices for EC2 cost optimization in AWS - 20240529
+- Source file: Cloud & DevOps/Public-Cloud-Learning-Sessions/05_FinOps/public-cloud-learning-sessions-best-practices-for-ec2-cost-optimization-in-aws-2.md
+- Status: ✅ 成功摄入
+- Summary: Mike Dukes 和 Steele Taylor（AWS 专家）主讲 EC2 成本优化最佳实践——AWS Nitro 系统外部化网络/存储/安全组件提升效率；Graviton ARM 处理器基于 ARM64 架构，提供 40% 性价比提升，功耗减少 60%；EC2 Spot 实例利用闲置容量提供 90% 折扣；购买选项包括 On-Demand/Savings Plans/Spot Instances；Spot Invaders 游戏展示容错混沌工程实践；Spot + Graviton + 容器组合实现最大化成本节省
+- Concepts created: [[Nitro-System]], [[EC2-Purchase-Options]]
+- Concepts linked: [[Graviton]], [[Spot Instances]], [[Savings Plans]], [[FinOps]], [[Cloud Cost Optimization]]
+- Entities identified: Mike Dukes 和 Steele Taylor 为演讲者，但提及次数不足 2 次，以 wikilink 形式记录于 Source page
+- Source page: wiki/sources/public-cloud-learning-sessions-best-practices-for-ec2-cost-optimization-in-aws-2.md
+- Notes: index.md 已更新（Sources 节新增条目）；overview.md 已补充（FinOps 章节新增段落，置于 ctp-topic-13 后）；Nitro-System 和 EC2-Purchase-Options 不存在于现有 Wiki，新建 Concept 页面；已建立与 public-cloud-learning-sessions-reducing-cloud-costs-20250318-170100-meeting-reco、ctp-topic-13-cloud-finops-policies 的 Connections 关系
+- Conflicts: 与 ctp-topic-14-octane-hub-on-aws 可能的冲突（Graviton 对有状态服务的适用性），已记录于 Source page Contradictions 节
+
 ## [2026-04-25] ingest | Public Cloud Learning Sessions - Reducing Cloud Costs - 20250318
 - Source file: Cloud & DevOps/Public-Cloud-Learning-Sessions/05_FinOps/public-cloud-learning-sessions-reducing-cloud-costs-20250318-170100-meeting-reco.md
 - Status: ✅ 成功摄入