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## 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 * Update msrv action Co-authored-by: Eliza Weisman <eliza@buoyant.io>