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loki/docs/troubleshooting.md

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Troubleshooting

"Data source connected, but no labels received. Verify that Loki and Promtail is configured properly."

This error can appear in Grafana when you add Loki as a datasource. It means that Grafana can connect to Loki, but Loki has not received any logs from promtail. This can have several reasons:

  • Promtail cannot reach Loki, check promtail's output.
  • Promtail started sending logs before Loki was ready. This can happen in test environments where promtail already read all logs and sent them off. Here is what you can do:
    • Generally start promtail after Loki, e.g., 60 seconds later.
    • Restarting promtail will not necessarily resend log messages that have been read. To force sending all messages again, delete the positions file (default location /tmp/positions.yaml) or make sure new log messages are written after both promtail and Loki have started.

Failed to create target, "ioutil.ReadDir: readdirent: not a directory"

The promtail configuration contains a __path__ entry to a directory that promtail cannot find.