wow I always thought that Prom UI was just a tacked-on part of alertmanager or something because it’s so rudimentary. In my experience, everyone just uses Grafana Explore since that’s what Grafana was originally purpose-built for and it’s crazy easy to set up. Just pull down a container or helm chart or whatever.

Since Grafana built Loki, it doesn't make any sense why Grafana would create a separate querying UI app for Loki when they already have Grafana Explore. Prometheus (and I assume its UI) was created by Google [edit: sorry, created by SoundCloud, inspired by a Google Borg tool] before Grafana became the de facto Prometheus query UI, so it’s not really analogous.