Monitoring is available in the free subscription, which cannot be used by SaaS providers. And now that we have an alternative: the Elastic monitoring plugin is pretty neat, but the Open Distro Performance Analyzer looks way more powerful. I’ve had the Elastic monitoring UI and a regular ‘perf top’ open with still no clue as to why Elasticsearch was eating CPU (relative to the query load). It looks like Performance Analyzer brings far more to the table.
That's called Source-available and sometimes that's even worse because you (legally) cannot re-implement something similar after you have looked at the code.
> but you cannot (legally) use it without a paid subscription
Sounds worse than my thoughts in the comment, considering the pricing for self-hosted nodes (happend that I know them).