VictoriaMetrics was able to accept Graphite data from 2019 - see these docs. While MetricsQL and PromQL are powerful query languages, Graphite users wanted to use Graphite query language directly from VictoriaMetrics, since this allows seamless migration from Graphite to VictoriaMetrics without the need to modify dashboards and alerting rules in Grafana. So we added support for Graphite query language into VictoriaMetrics at the beginning of 2021 - see these docs for details.