✨(backend) Adding /prometheus metrics endpoint #455

[lindenb1]

implements various metrics for users, documents and the actual django application

Purpose

The purpose of this implementation is to provide detailed insights into the usage patterns and performance of the Django application. By collecting metrics for users, documents, and the application itself, developers and administrators can monitor activity, identify bottlenecks, and optimize performance. These metrics are also essential for integrating with monitoring systems like Prometheus, enabling observability and proactive issue resolution.

Proposal

Introduce a custom Prometheus metrics collector that gathers and exposes detailed information about user activity, document usage, and the application's operational status.

Key Features

- Monitor user activity over different time periods (e.g., today, last 7 days, last 30 days).
- Track document-related statistics, such as total documents, active documents, and shared documents.
- Expose application-level metrics to ensure seamless integration with Prometheus and related monitoring tools.