Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

DocumentationLoki DocumentationClientsPromtailStagesoutput

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.

Schema

yaml Copy

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

Example

For the given pipeline:

yaml Copy

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

And the given log line:

Copy

{"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!