Most integration failures are not caused by missing features. They are caused by unclear operational behavior when calls timeout, dependencies degrade, or payloads are partially valid.
Production-grade interfaces need explicit contracts: clear error classes, idempotent writes, retry with backoff, and request correlation from edge to downstream services. This directly shortens diagnosis time.
Monitoring should include business outcomes, not only transport status. Track success rates per message type, processing latency distribution, and queue pressure to detect operational drift before incidents escalate.