Document need of opentelemetry::global::shutdown_tracer_provider()?

[alexpdp7]

Feature Request

Motivation

I was playing with tracing and OpenTelemetry and I was noticing that under some conditions, my test applications were not sending traces at all.

Looking at one of the examples, I saw opentelemetry::global::shutdown_tracer_provider(). Adding this at the end of my program made things work reliably (apparently!).

I think this is related to very short programs that run quickly. Somehow accumulated traces are lost on exit.

Proposal

While this is documented in the opentelemetry crate, and I found it in the examples, I think users of this crate would appreciate some nudging towards this.

Alternatives

Or perhaps, the shutdown can happen automatically? That would be even better.