Flushing Global Meter Provider

[michaeljtang]

I am using otel metrics, specifically opentelemetry::global. I am using global::set_meter_provider on startup to initialize my metrics, and then creating new meter providers via global::meter.

I would like to be able to flush my meter provider, specifically as a part of cleanup in my application's panic hook. I can see that SdkMeterProvider has a force_flush method. However, global::meter_provider returns a dyn MeterProvider, which from what I can tell does not have a flush method. In this scenario, is there a recommended way for the meter provider to be flushed before shutdown? Or will I need to manually store my initial SdkMeterProvider that I use for global::set_meter_provider for shutdown?

[cijothomas]

You need to store the SdkMeterProvider and call flush/shutdown on it. (A clone of it can be set as the global_one)

The examples should already be showing this approach:
https://github.com/open-telemetry/opentelemetry-rust/blob/main/examples/metrics-basic/src/main.rs

We expect to tweak the wording here to make this more clear:
https://github.com/open-telemetry/opentelemetry-rust/blob/main/docs/metrics.md#meterprovider-management