Agent telemetry is append-heavy, time-stamped, and high-cardinality — a workload profile that maps well to columnar, time-series-oriented storage rather than index-everything platforms. Prompt and completion logs grow quickly, and log analytics architectures designed for high-throughput event streams handle the volume more cost-effectively than general-purpose search indexes. A data lake tier for long-retention compliance replay, paired with a hot tier for real-time querying, is a practical two-layer approach for most production deployments.