Status: IN
Metrics maintains its sorted timestamp invariant through both ingestion (bisect insertion for O(log n) per-point insert) and two-tier downsampling (re-sort after age-based aggregation), ensuring temporal queries are correct across all retention tiers.
Sorted order is re-established after downsampling, not merely assumed to survive aggregation
Depends on (SL): metrics-series-sorted-invariant, metrics-downsample-two-tier