Open source software is the de facto standard for many new applications, this is especially true in the database industry. Currently, MySQL, PostgreSQL, MariaDB, MongoDB, Elastic, and others have shown up in every industry and organization in the world in some form or another. People are no longer choosing a single database for the company, they are letting developers and architects choose the best database for the job.
This has led to an increase in the number of technologies operations teams have to support. Couple that increases in technologies with a growing micro-service ( or cloud-native ) development paradigm where every service has its own database and where all the data is valuable.
Now companies are now faced with dozens of technologies, hundreds or even thousands of individual database instances, and petabytes of data. The management of the complexity of such an environment is changing the way we look at systems and operations.