What are some good options for the Oracle DB monitoring these days?

In this slightly opinionated LAB, I want to explore what are some good modern options to monitor your databases (or fleet of them). We'll consider different approaches to monitoring and play around with some of the best tools for the job.

We'll dive into:
- OEM 24ai - what's good actually about it, using emcli to automate most of it
- Grafana (with different backends and oracle's node_exporter) - some good practical use cases
- ELK stack - the king of log analysis for all your databases - I'll share the techniques I use to analyze Oracle's logs at large scale and other cool tricks for data analysis
- analyzing Oracle logs with local LLMs - a feasible approach
- my own monitoring framework - opinionated portable PL/SQL framework to measure, record and analyze metrics in databases you don't have direct access to