I have worked on the DataDog and ELK stack which where prominent in APM and Log analysis. They have huge advantage on cloud, ELK was open-source earlier but they moved to closed and removed certain features in open version as the community screams. Prometheus & Grafana are not that proficient in APM, I was searching for some tools and found signoz, The UI looks cool and Interesting, I am still exploring the tool and love to contribute from my side.