Denzil Ribeiro shows how you can use Telegraf and Grafana to monitor Azure SQL Database databases:
SQL DB Storage
This is the dashboard for monitoring file size and space used, IO latency, and IO throughput, for each file in the database. When using Standard or General Purpose databases, which use data files in Azure blob storage, storage performance depends on several blob properties, exposed via the FILEPROPERTYEX() function.
Aside from a couple Azure SQL DB-specific steps, it’s basically the same process that Tracy Boggiano has for monitoring on-prem and IaaS SQL Server instances.