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tracing/.github
Julian Tescher 982526f02b opentelemetry: update otel to 0.18.0 (#2303)
## Motivation

Support the latest OpenTelemetry specification.

## Solution

Update `opentelemetry` to the latest `0.18.x` release. Breaking changes
in the metrics spec have removed value recorders and added histograms so
the metrics layer's `value.` prefix has been changed to `histogram.` and
behaves accordingly. Additionally the `PushController` configuration for
the metrics layer has been simplified to accept a `BasicController` that
can act in either push or pull modes. Finally trace sampling in the
sdk's `PreSampledTracer` impl has been updated to match the sampling
logic in https://github.com/open-telemetry/opentelemetry-rust/pull/839.

* Update MSRV to 1.56
* Update examples
* Fix async-trait dep
2022-09-15 16:54:07 -07:00
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