EC2 Decommission & Right-Sizing¶

🖥️ Instance Cost Optimization | Commands: runbooks finops ec2-decommission-analysis, runbooks finops analyze-ec2

Overview¶

Identify idle, underutilized, and oversized EC2 instances with 4-way enrichment (cost, activity, scoring).

When to Use¶

Scenario	Command	Savings Potential
Weekly Idle Instance Hunt	`runbooks finops ec2-decommission-analysis --all-profiles --threshold 90`	$2K-$4K/week
Instance Right-Sizing Review	`runbooks finops analyze-ec2 --all-profiles`	$500-$1K per instance
EBS Snapshot Cleanup	`runbooks finops ec2-snapshots --all-profiles`	$200-$500/month

Usage Examples¶

Example 1: High-Confidence Decommission Targets (5 min)

runbooks finops ec2-decommission-analysis \
  --all-profiles \
  --threshold 90 \
  --output-dir ./targets

# Output: targets/decommission-must.csv
# 12-15 instances with:
# - Cost/month (highest first)
# - Last activity (>30 days idle)
# - Confidence score (90-100 = safe to decommission)
# - Business case: $6.5K/month savings

Example 2: Right-Sizing Candidates (3 min)

runbooks finops analyze-ec2 \
  --all-profiles \
  --filter underutilized \
  --min-monthly-cost 50

# Output: Instances with:
# - Current instance type (e.g., t3.2xlarge)
# - Recommended type (e.g., t3.large)
# - Monthly savings per instance ($200-$500)
# - Risk score (low = safe to resize)

Example 3: Snapshot Cost Audit (2 min)

runbooks finops ec2-snapshots \
  --all-profiles \
  --delete-unattached

# Output:
# - Orphaned snapshots identified: 250+ snapshots
# - Total waste: $800-$1200/month
# - Risk: None (unattached → safe to delete)

Enrichment Signals (E1-E7)¶

Signal	Definition	Data Source
E1	Monthly cost	AWS Cost Explorer API
E2	CPU utilization	CloudWatch (14-day avg)
E3	Network traffic	VPC Flow Logs (14-day sum)
E4	EBS IOPS usage	CloudWatch metrics
E5	Application logs	CloudWatch Logs (90-day check)
E6	SSM Session activity	Systems Manager (90-day check)
E7	Compute Optimizer recommendation	AWS Compute Optimizer API

workspaces-decommission-analysis - Desktop/virtual desktop cleanup
detect-orphans - Cross-resource orphan detection
ec2-snapshots - EBS snapshot cost optimization

MCP Validation¶

Decommission scoring validated at ≥99.5% accuracy using multi-signal confidence (E1-E7).