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Monitoring AWS RDS may require some observability strategy changes if you switched from a classic on-prem MySQL/PostgreSQL solution.
AWS RDS is a great solution that helps you focus on the data, and forget about bare metal, patches, backups, etc. However, since you don't have direct access to the machine, you'll need to adapt your monitoring platform.
Getting started with PromQL can be challenging when you first arrive in the fascinating world of Prometheus; here’s a PromQL cheatsheet with interesting tips. Since Prometheus stores data in a time-series data model, queries in a Prometheus server are radically different from good old SQL.
Understanding how data is managed in Prometheus is key to learning how to write good, performant PromQL queries.