# CCIP Incident Response

## Overview

This document outlines the incident response procedures for CCIP-related issues.

## Severity Levels

### Critical (P1)
- Complete service outage
- All messages failing
- Router unavailable
- Security breach

### High (P2)
- High error rate (> 10%)
- Significant message delays
- Fee calculation failures

### Medium (P3)
- Intermittent failures
- Minor delays
- Configuration issues

### Low (P4)
- Minor errors
- Performance degradation
- Non-critical issues

## Response Procedures

### P1: Critical Incident

1. **Immediate Actions** (0-15 minutes)
   - Acknowledge incident
   - Assess impact
   - Notify team
   - Check service status

2. **Investigation** (15-60 minutes)
   - Review logs
   - Check router status
   - Verify contract state
   - Identify root cause

3. **Mitigation** (60+ minutes)
   - Implement fix
   - Verify resolution
   - Monitor recovery
   - Document incident

### P2: High Priority

1. **Initial Response** (0-30 minutes)
   - Acknowledge issue
   - Assess impact
   - Begin investigation

2. **Resolution** (30-120 minutes)
   - Identify cause
   - Implement fix
   - Verify resolution

### P3/P4: Medium/Low Priority

1. **Documentation**
   - Log issue
   - Investigate during business hours
   - Plan fix
   - Implement resolution

## Common Incidents

### All Messages Failing

**Symptoms**: No messages being delivered

**Response**:
1. Check router status
2. Verify LINK balance
3. Check target chain status
4. Review recent changes
5. Check contract state

**Resolution**:
- Restart router if needed
- Refill LINK if low
- Fix configuration issues
- Update contracts if needed

### High Error Rate

**Symptoms**: > 10% of messages failing

**Response**:
1. Check error logs
2. Identify error pattern
3. Check target chain
4. Review message format

**Resolution**:
- Fix message format if invalid
- Update target chain selector if wrong
- Fix receiver contract if needed
- Update configuration

### Router Unavailable

**Symptoms**: Cannot connect to router

**Response**:
1. Check router deployment
2. Verify network connectivity
3. Check router logs
4. Review recent changes

**Resolution**:
- Restart router service
- Fix network issues
- Update router address if changed
- Redeploy if necessary

### Insufficient LINK

**Symptoms**: "Insufficient LINK" errors

**Response**:
1. Check LINK balance
2. Calculate required amount
3. Transfer LINK tokens
4. Verify balance updated

**Resolution**:
- Transfer LINK to sender contract
- Set up automatic refill
- Monitor balance regularly

## Communication

### Internal Communication

- Update team channel
- Create incident ticket
- Document findings
- Share resolution

### External Communication

- Update status page if public
- Notify stakeholders if critical
- Provide ETA if known
- Share resolution details

## Post-Incident

### Incident Review

1. **Root Cause Analysis**
   - What happened?
   - Why did it happen?
   - How was it resolved?

2. **Lessons Learned**
   - What went well?
   - What could be improved?
   - Action items

3. **Documentation**
   - Update runbooks
   - Add monitoring
   - Improve procedures

### Follow-up Actions

- Implement preventive measures
- Update monitoring
- Improve documentation
- Schedule training if needed

## Escalation

### When to Escalate

- P1 incidents not resolved in 1 hour
- P2 incidents not resolved in 4 hours
- Security-related issues
- Data loss or corruption

### Escalation Path

1. Team Lead
2. Engineering Manager
3. CTO/Technical Director
4. External Support (Chainlink)

## References

- [CCIP Operations Runbook](ccip-operations.md)
- [CCIP Troubleshooting](../docs/CCIP_TROUBLESHOOTING.md)
- [CCIP Recovery Procedures](ccip-recovery.md)