switching out promtail for alloy (#22)

* rework grafana log ingestion using alloy

* fix docker-compose.yml formatting

files/grafana/README.md

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+# Grafana Configuration
+
+This directory contains the configuration for Grafana, which serves as the visualization and dashboarding platform for the CS Repro environment.
+
+## Overview
+
+Grafana is an open-source platform for monitoring and observability that allows you to query, visualize, alert on, and understand your metrics, logs, and traces.
+
+## Current Setup
+
+- Running as a single instance (version 10.0.4)
+- Available at http://localhost:3000
+- Default credentials: admin/admin
+
+## Directory Structure
+
+- **dashboards/**: Contains JSON dashboard definitions
+  - `enhanced_logs.json`: Dashboard for viewing and filtering Mattermost logs
+  - `kpiMetrics.json`: Dashboard for key performance indicators
+  - `metricsv2.json`: Dashboard for detailed application metrics
+  - `bonusMetrics.json`: Dashboard for additional metrics
+
+- **provisioning/**: Contains automatic provisioning configurations
+  - `datasources/`: Configures data source connections
+  - `dashboards/`: Sets up dashboard loading
+
+## Data Sources
+
+The environment is configured with the following data sources:
+
+1. **Prometheus** (Default): For metrics collection
+   - URL: http://prometheus:9090
+   - Used by most of the metric dashboards
+
+2. **Loki**: For log aggregation
+   - URL: http://loki:3100
+   - Used by the enhanced_logs dashboard
+   - Queries using the LogQL language
+
+## Log Dashboard
+
+The `enhanced_logs.json` dashboard is designed to work with logs collected via Alloy and stored in Loki. It provides:
+
+- Log filtering by level (error, warn, info, debug)
+- Visual metrics about log levels and counts
+- Error tracking and analysis
+- Time-series views of log patterns
+
+The dashboard queries use the label `job="mattermost"` to filter logs from the Mattermost application.
+
+## Best Practices
+
+When modifying dashboards:
+- Export/backup existing dashboards before making major changes
+- Test queries in the Explore interface before adding to dashboards
+- Use variables for consistent filtering across panels
+- Maintain consistent styling
+
+## More Information
+
+- [Grafana Documentation](https://grafana.com/docs/grafana/latest/)
+- [Dashboard JSON Model](https://grafana.com/docs/grafana/latest/dashboards/build-dashboards/dashboard-json-model/)
+- [LogQL in Grafana](https://grafana.com/docs/grafana/latest/datasources/loki/query-editor/)