High Cardinality in Metrics: Challenges, Causes, and Solutions
In data terms, cardinality refers to the number of unique values in a dataset. High cardinality means that a column or field has a very large number of unique values. If you think about some of the typical metric labels we handle as DevOps engineers or software developers, things like user IDs, request paths, or device IDs often come with a seemingly endless variety of values.