Reference:
https://docs.microsoft.com/en-us/azure/azure-sql/database/sql-database-paas-overview

Reference:
https://docs.microsoft.com/en-in/azure/azure-monitor/overview

A key/value store associates each data value with a unique key.
An application can store arbitrary data as a set of values. Any schema information must be provided by the application. The key/value store simply retrieves or stores the value by key.
Reference:
https://docs.microsoft.com/en-us/azure/architecture/guide/technology-choices/data-store-overview