⚠️ This is by no means a complete list. We will add to over time. A more in depth analysis could really be considered as most of these are a rather surface level analysis.
By far the most popular solution in open source today, Prometheus makes it easy for anyone to instrument their systems. It's been around for a long time and has a lot of community support. However, Prometheus (metrics), Loki (logs), Tempo (traces), and Mimir (metrics) all handle similar kinds of information, but storage and configuration varies between each solution, making it a pain to maintain and administer.
While the LGTM/P stack works well for logs, traces, and metrics, it falls quite short for business intelligence.
The ElasticStack, more commonly referred to as ELK, is a fairly popular stack that used in a number of different fields. The ELK stack is certainly closer to a more modern observability, operations, and business intelligence stack. However, it can be fairly expensive to run, and the stack lacks a couple necessary components. Furthermore, there's a lot of hesitancy and skepticism from the open source community when produce whose license recently change get involved.