APM... I miss New Relics APM, but it is not an option now. For reasons. Is there anything I can use that comes close? Maybe open source, but at least on-prem-ish-able?

Opentelemetry agent could come close, but the analysis/UI part of the equation seams weak. What is the best?

@anderssv We ended up pivoting to DataDog before I had a chance to try it out but OpenSearch supposedly has support for analyzing traces that come from OpenTelemetry https://opensearch.org/docs/latest/observing-your-data/trace/index/ might be worth a look.
Trace Analytics

Trace Analytics

OpenSearch Documentation
@jonnyshare Looks decent. Analyzing separate spans seems like it is included in most places. What I am really looking for is kind of app -> endpoint -> how is this performing -> what is the aggregated numbers for usage. And by aggregated I mean stuff like 23% DB, X queries, 34% this HTTP call. NR was awesome at this digging around.