I would ask this a different way--is there a single OSS project that handles collecting all of the OTEL metrics/logs/traces? Folks keep saying you can't do this in data store/format, Elastic seems to, and having to manage separate storage/infrastructure for all of these tools is intense.
Could Prometheus be augmented to store metrics, logs, and traces somehow? I don't really mind if it doesn't scale well on a single instance or is highly available, I'll just add more instances and aggregate them.