Promtail is an agent which can tail your log files and push them to Loki.

Promtail is an agent which ships the contents of local logs to a private Loki instance or Grafana Cloud. It is usually deployed to every machine that has applications needed to be monitored. It primarily: Discovers targets Attaches labels to log streams Pushes them to the Loki instance. Currently, Promtail can tail logs from two sources: local log files and the systemd journal