Why not self host grafana and Loki? It’s not hard and the cost for redundancy and backups running on tons of nodes with fast internet isn’t anything new. Much cheaper
My experience is with Kibana and Honeycomb; but in my experience, Grafana, even with Tempo, pales in comparison to the power that the ELK stack or a robust, clean UI’d data aggregator, like Honeycomb is capable of.