What are some examples of Promtail configurations?

Can you provide some examples of Promtail configurations?

Sure! Promtail is used to collect logs and send them to Loki. Here are a few configuration examples.

What is the basic configuration for a file-based log collection?

A basic configuration would look like this:

server:
  http_listen_port: 9080

positions:
  filename: /tmp/positions.yaml

clients:
  - url: http://localhost:3100/loki/api/v1/push

scrape_configs:
  - job_name: system
    static_configs:
      - targets:
          - localhost
        labels:
          job: varlogs
          __path__: /var/log/*.log

How can I filter logs based on labels?

You can use the relabel_configs section in your scrape configuration to filter logs. For example:

relabel_configs:
  - source_labels: [__meta_kubernetes_namespace]
    action: keep
    regex: default