CS-Repro-Mattermost/files/loki

Loki Configuration

This directory contains the configuration for Grafana Loki, which serves as the log storage and aggregation system in this environment.

Overview

Loki is a horizontally-scalable, highly-available, multi-tenant log aggregation system designed by Grafana Labs. It is optimized for efficiently storing and querying logs from Kubernetes and microservices deployments.

Current Setup

• Running as a single instance in this CS Repro environment
• Available at http://localhost:3100
• Receives logs from Grafana Alloy (which replaced Promtail)

Configuration Details

The loki-config.yaml file contains the core configuration for the Loki service:

• Storage: Configured to use the local filesystem for simplicity
• Schema: Uses the v11 schema with appropriate index/chunk configurations
• Compaction: Enabled to optimize storage over time
• Limits: Configured with reasonable defaults for this environment
• Frontend: Configured for basic query handling

Querying Logs

Logs can be queried in several ways:

1. LogQL via Grafana: The primary and most user-friendly method
2. Direct Loki API: Using the API endpoints at http://localhost:3100/loki/api/v1/
3. LogCLI: If installed, you can use Grafana's logcli tool

Example LogQL queries:

{job="mattermost"} | json | level=~"error|warn"
{job="mattermost"} | json | level="error" | line_format "{{.msg}}"

Labels

The current configuration uses the following key labels:

• job: The source application ("mattermost")
• level: The log level (error, warn, info, debug, etc.)
• service_name: Identifies the service
• filename: The source log file

More Information

• Grafana Loki Documentation
• LogQL Query Language