There is no support for log collection with the opentelemetry sdk library yet. You need to rely on collecting from the files or similar. Depending on env you run, here is a guide on the collector https://signoz.io/docs/userguide/logs/
SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.