Grafana 6.4 introduced the ability to use Loki, a log aggregation system, as an annotation query source, enhancing insights by overlaying events on graphs. Previously, Grafana users could not visualize Loki data on dashboards, but the update allows using Loki for annotations, making it possible to overlay data from log streams or send new events manually. Users can either filter existing logs using LogQL for relevant events or manually push events to Loki via its API. To implement this, users need to set up a Loki instance, configure it as a data source, and use annotation queries to display events on Grafana dashboards. This development allows for a more comprehensive understanding of system behavior by integrating logs and events into visual data representations.