Apollo Observability Overview Comprehensive observability for Apollo.io integrations: Prometheus metrics (request count, latency, rate limits, credits), structured logging with PII redaction, OpenTelemetry tracing, and alerting rules. Tracks the metrics that matter: credit burn rate, enrichment success rate, and API health. Prerequisites - Valid Apollo API key - Node.js 18+ Instructions Step 1: Prometheus Metrics Step 2: Axios Interceptors for Auto-Collection Step 3: Structured Logging with PII Redaction Step 4: OpenTelemetry Tracing Step 5: Alerting Rules Step 6: Metrics Endpoint Output - Pr…