Customer.io Observability Overview Implement comprehensive observability for Customer.io integrations: Prometheus metrics (latency, error rates, delivery funnel), structured JSON logging with PII redaction, OpenTelemetry tracing, and Grafana dashboard definitions. Prerequisites - Customer.io integration deployed - Prometheus + Grafana (or compatible metrics stack) - Structured logging system (pino recommended) Key Metrics to Track | Metric | Type | Description | Alert Threshold | |--------|------|-------------|----------------| | | Histogram | API call latency | p99 5000ms | | | Counter | Tot…