Is formating for log messages actually implemented?

[GeorgViehoever]

I am trying to use formatting for log messages as suggested in

opentelemetry-cpp/api/include/opentelemetry/logs/logger.h

Line 287 in e86ceba

* @format an utf-8 string following https://messagetemplates.org/

. It does not seem to work.
Q: Is it actually implemented?
Q: Do you have an example code for me? Something like:

std::map<std::string, std::string> labelsTrace = {{"userId", "myUserId"}};
 logger->Trace(
 	  "traceLogMessage of user {userId}";
 	  labelsTrace);

[lalitb]

Perhaps this needs to be documented better. The formatting of the message is not done by OpenTelemetry SDK, but the onus is on upstream agents or exporters who want the support.

[GeorgViehoever]

I suggest to make this into a bug that requests to improve documentation. I believe I found nothing to this effect in the Docs or any code comments.