Metrics Aggregation。Prometheus 3.0 (Native Histograms+UTF-8 Labels)・Grafana Mimir 2.14 (TSDB+Long-term Storage)・Cortex (Maintenance→Mimir)・Thanos (HA Prometheus・Multi-cluster)・VictoriaMetrics 1.105 (Lightweight・10x Less Memory)・InfluxDB 3.0 Core/Enterprise (Apache Arrow+Parquet)・OpenTSDB (Maintenance)・GreptimeDB 0.10・OpenObserve・Beszel (Self-Host・Single Bin)・¥0 OSS、2026年Prometheus 3 Native Histograms拡大。