CS-Repro-Mattermost/files/alloy

Alloy Log Agent Configuration

This directory contains the configuration for Grafana Alloy, which has replaced Promtail as the log agent in this environment.

Key Differences

• Alloy uses a component-based configuration format with .alloy extension
• The web UI is available at http://localhost:9080
• Alloy can handle logs, metrics, and traces in one agent
• Configuration is more flexible with the River language

Configuration Explanation

The config.alloy file follows the component-based model where:

1. loki.source.file components directly collect logs from Mattermost log files
2. loki.process component parses and labels the JSON logs
3. loki.write component sends the logs to Loki

Current Setup

Our configuration:

• Monitors Mattermost logs directly from mounted volumes
• Labels all logs with job="mattermost" for Grafana dashboard compatibility
• Extracts log level, message, and other metadata from JSON logs
• Sends logs to Loki service

Converting Promtail Config to Alloy

If you need to update the configuration, you can convert Promtail configs to Alloy format with:

# Example using the alloy CLI (if installed locally)
alloy convert --source-format=promtail --output=config.alloy promtail-config.yaml

Important Syntax Notes

• The River language used by Alloy requires commas at the end of each key-value pair in objects
• Trailing commas in lists and objects are supported and recommended

More Information

• Grafana Alloy Documentation
• Migrating from Promtail to Alloy