Good summary, Nikita!
All the components are open source. Enjoy the freedom! You will only pay your hosting costs.”
This bugs me because the most expensive thing is not listed — the time one has to invest in most of open-source-based setups…. on an ongoing basis…. especially when such setups are made up of multiple tools, which is typically the case, including here.
the choice will depend on whether you want something ready to be used as SaaS, and in that case you will choose Datadog or NewRelic, or you can afford to setup an self-hosted solution with open source components, and in that case the first two options are probably the best.
If one doesn’t want SaaS open-source is not the only option, of course. For example, Sematext Enterprise (https://sematext.com/enterprise) is a good solution one can run on premises (vs. https://sematext.com/cloud which is a SaaS). The same with Splunk and a few others.