근본 원인 분석(Root Cause Analysis)

Timeline Entry 1: hypothesis_created
├── Hypothesis 1: "Database connection pool exhaustion"
├── Confidence: 0.75
└── Message: "Pool exhaustion likely given 500s response times"

Timeline Entry 3: hypothesis_ruled_out
├── Hypothesis 1: Ruled Out
├── Reason: "DB metrics show 45/100 connections—well within limits"
└── Evidence: Max concurrent connections remained stable

Timeline Entry 6: hypothesis_created
├── Hypothesis 2: "Lambda cold start latency after memory reduction"
├── Confidence: 0.85

Timeline Entry 8: hypothesis_confirmed
├── Hypothesis 2: Confirmed
├── Updated Confidence: 0.92
└── Evidence: CloudWatch init duration spike, deployment timing match

{
  "auto_trigger_rca": true,
  "auto_trigger_rca_min_severity": "medium"
}

@alex #report investigate EC2 termination patterns for the past 60 days.
Break down by Auto Scaling group, termination reason, instance type, and
availability zone — and explain the 17:15 UTC daily terminations.

@alex #report correlate CreateNetworkInterface failures with EC2
termination events over the last 60 days. Determine whether aggressive
scale-downs cause IP address fragmentation and whether lifecycle hooks
allow proper ENI cleanup.

@anna #report comprehensive RCA for the EC2 termination and EKS network
interface failures. Include an executive summary, the 60-day timeline,
remediation steps with owners and due dates, and preventive measures.