For a long time now, there are two major contestants for the "logs collection and shipping" throne. Those are Logstash (https://www.elastic.co/products/logstash) and Fluentd (https://www.fluentd.org/). Both are open source, and both are widely accepted and actively maintained. While both have their pros and cons, Fluentd turned up to have an edge with cloud-native distributed systems. It consumes fewer resources and, more importantly, it is not tied to a single destination (Elasticsearch). While Logstash can push logs to many different targets, it is primarily designed to work with Elasticsearch. For that reason, other logging solutions adopted Fluentd.
As of today, no matter which logging product you embrace, the chances are that it will support Fluentd. The culmination of that adoption can be seen by Fluentd's entry into...