Customer.io Advanced Troubleshooting Overview Advanced debugging techniques for complex Customer.io issues: systematic investigation framework, API debug client, user profile analysis, campaign/broadcast debugging, network diagnostics, and incident response runbooks. Prerequisites - Access to Customer.io dashboard (admin recommended) - Application logs access - for API testing Troubleshooting Framework For every issue, answer these five questions first: 1. What is the expected vs actual behavior? 2. When did the issue start? (Check deploy history, CIO status page) 3. Who is affected — one use…