Grafana Loki documentation Send data Promtail Pipeline stages sampling

sampling

The sampling stage is a stage that sampling logs.

Sampling stage schema

The sampling stage is used to sampling the logs. Configuring the value rate: 0.1 means that 10% of the logs will be pushed to the Loki server.

yaml

sampling:
  # The rate sampling in lines per second that Promtail will push to Loki.The value is between 0 and 1, where a value of 0 means no logs are sampled and a value of 1 means 100% of logs are sampled.
  [rate: <int>]  

Examples

The following are examples showing the use of the sampling stage.

sampling

Simple sampling

Given the pipeline:

yaml

- sampling:
    rate: 0.1

Match a line and sampling

Given the pipeline:

yaml

pipeline_stages:
- json:
    expressions:
      app:
- match:
    pipeline_name: "app2"
    selector: "{app="poki"}"
    stages:
    - sampling:
        rate: 0.1

Complex sampling stage configurations.