As organizations adopt cloud-native architectures, logging costs have surged due to escalating data volumes, vendor pricing models, and inefficient practices. This paper examines the root causes of rising logging expenses (e.g., unstructured data, over-retention) and presents a framework for cost optimization without compromising observability. We evaluate three key strategies: (1) sampling (head- and tail-based) to reduce volume, (2) filtering to eliminate low-value logs (e.g., health checks), and (3) tiered storage (hot/cold) to align retention with access needs. Furthermore, we compare open-source alternatives (Grafana Loki, SigNoz) to commercial solutions (Datadog, Elastic Cloud), highlighting trade-offs in cost, scalability, and functionality. A case study demonstrates how structured logging and pipeline optimizations reduced costs by 60% for a mid-sized enterprise. The paper concludes with best practices for implementing these strategies, emphasizing the importance of context-aware logging and vendor-agnostic tooling. This work provides actionable insights for engineering teams seeking to balance cost efficiency with diagnostic capability in distributed systems.
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