Victoriametrics for metrics (7x ram reduction vs prom), Loki for logs but evaluating Victorialogs. Then grafana for ui. Cannot recommend vm enough, it’s fantastic.
If you hit some issues with VictoriaLogs or if you have ideas on how VictoriaLogs usability could be improved, then please file issues at https://github.com/VictoriaMetrics/VictoriaMetrics/issues/ . We appreciate users' input and always try making our products easier to use.