Cortex, originally developed as Project Frankenstein by Julius Volz and Tom Wilkie, is an open-source project designed to enhance the scalability and reliability of Prometheus by providing multi-tenant, horizontally scalable, and long-term storage capabilities. Initially supported by Grafana Labs, which later transitioned its focus to Grafana Mimir, Cortex has evolved to handle the ingestion of hundreds of billions of samples per day through innovations like consistent hashing, replication, and schema optimization. These improvements address bottlenecks in data compression and indexing, allowing efficient storage and retrieval of metrics across distributed systems. The architecture employs techniques like index caching and query parallelization to manage vast volumes of data and improve query performance. Currently, Cortex supports various storage backends, including Bigtable, Cassandra, DynamoDB, GCS, and S3, and is being refined for use in enterprise environments, emphasizing centralized monitoring and alerting capabilities. Future developments aim to integrate TSDB with Cortex, leveraging Thanos to optimize performance and maintain efficient data management across multi-tenant systems.