Loki Multi-Cluster Log Aggregation Across AWS Regions

Short summary

Loki multi-cluster aggregation eliminates manual context-switching during cross-region incidents by centralizing log ingestion through a hub-and-spoke topology. The post details three critical mistakes: separate Loki stacks per region, unmanaged filesystem backends, and high-cardinality label explosion. Recommended approach uses one microservices-mode Loki with shared S3 storage, regional Grafana Alloy agents, auth enabled, and reduced chunk_idle_period.

• •Hub-and-spoke topology centralizes logs while keeping agents close to workloads, eliminating cross-datasource context-switching during incidents
• •Three critical mistakes: multiple Loki instances, unmanaged filesystem backends, and high-cardinality labels in the index instead of log content
• •Production setup: one centralized Loki in microservices mode, regional agents pushing to shared S3, auth enabled, chunk_idle_period set to 5m

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