Grafana LokiClientsPromtailStagesoutput

output stage

The output stage is an action stage that takes data from the extracted map and changes the log line that will be sent to Loki.


  # Name from extracted data to use for the log entry.
  source: <string>


For the given pipeline:

- json:
      user: user
      message: message
- labels:
- output:
    source: message

And the given log line:

{"user": "alexis", "message": "hello, world!"}

Then the first stage will extract the following key-value pairs into the extracted map:

  • user: alexis
  • message: hello, world!

The second stage will then add user=alexis to the label set for the outgoing log line, and the final output stage will change the log line from the original JSON to hello, world!