[onefuncman]

The "OG" in the space is collectd, which is still my favorite choice if you are responsible at the operating system level: https://collectd.org/wiki/index.php/Chains

https://github.com/elastic/logstash was one of the first modern approaches. I started using it less the more often I ran into JRuby related bugs.

https://github.com/trivago/gollum is my pick from the golang ecosystem.

There are many more variants depending on how much complexity you are trying to apply. If you need to apply machine learning models, for example, you're probably going to end up with something similar to Apache Storm, though I don't know if it's operational story has improved enough to consider it over other alternatives, I lost track years ago between Apache Spark and the half dozen other stream processing projects.