What is TSDB in Prometheus and what is its function?

In Prometheus, TSDB stands for Time Series Database, and it is a type of database system used to store and manage time series data. TSDB in Prometheus is responsible for storing time series information of monitoring data, including metric data, label information, and timestamps. Through TSDB, Prometheus can persistently store monitoring data and support querying, aggregation, and visualization of monitoring data, helping users monitor the performance and health of systems. TSDB also supports functions such as compression, indexing, and query optimization for time series data, improving data storage efficiency and query performance. Therefore, TSDB is one of the core components of Prometheus and plays a crucial role in its monitoring function.