Integrated REST API Consumption Metrics for External System Interfacing

Abstract

As enterprise systems increasingly rely on REST APIs for external system integration, evaluating
performance solely from the provider side fails to capture the operational realities of API-driven
workflows. This study introduces an integrated consumption-focused evaluation framework that
measures request latency behavior, stability under concurrency, retry amplification, resource
utilization impact, and workflow continuity in Oracle APEX–based and similar enterprise
environments. Results show that performance variance often originates not from API endpoints but
from application-side session state interactions, load bursts, cache inefficiencies, and serialized
request dependencies. Consumption-aware monitoring revealed that workflow-sequencing patterns
can amplify small latency variations into system-level slowdowns. The findings highlight the
importance of incorporating consumption metrics to ensure robust, predictable, and scalable external
system interfacing within distributed cloud deployments.