Grafana Loki is an open-source log aggregation tool designed to integrate seamlessly with Prometheus by using the same label-based indexing system, which optimizes storage space and facilitates efficient querying of time-series logs. Originating from the need for an open-source solution that offers stable log storage with efficient search capabilities, Loki is built with a module-based architecture, including components like distributor, ingester, and querier, to handle data distribution and querying tasks. It provides a horizontally scalable environment, allowing users to scale components as necessary for log storage and query performance, although it requires a cloud account for production-level log storage. Despite being an inexpensive option and offering a low entry barrier for users familiar with Prometheus and Grafana, Loki has limitations, such as potential log loss without proper redundancy and reliance on community support. Proprietary tools like Coralogix offer additional features such as real-time analytics and anomaly detection, presenting viable alternatives for users requiring more robust logging and analysis capabilities.