chore: update opentelemetry dependencies to 0.27.0

[MathiasPius]

Motivation

New version 0.27.0 of the opentelemetry crates was recently released.

Solution

I've updated the dependencies and fixed any outstanding compilation issues caused by breaking changes in the upstream.

Two caveats:

• I was not able to resolve the compilation issues with https://github.com/tokio-rs/tracing-opentelemetry/blob/95f9ab97e239e5789d71b9636445d89e47612f65/benches/metrics.rs since the NoopMeterProvider has been hidden: [Metrics API] Mark NoopMeterProvider as pub(crate) open-telemetry/opentelemetry-rust#2191
• The metric "views" are now gated behind the feature spec_unstable_metrics_views, and I wasn't sure whether to still include it in the example: https://github.com/MathiasPius/tracing-opentelemetry/blob/d18214596c97b1243ee955a63bed3875a4f8f5f9/examples/opentelemetry-otlp.rs#L47-L82

[douggynix]

In order to solve the compilation issue from benches/metrics.rs with NoopMeterProvider,
you can declare NoopMeterProvider for the purpose of that metrics. it doesn't hurt replicating the logic in here.
I did it like this, it compiles successfully and the test was being to run successfully. Hope that helps for the compilation errors.

use opentelemetry::metrics::{InstrumentProvider, Meter, MeterProvider};

struct NoopMeterProvider{
    _private: ()
}

impl NoopMeterProvider {
    fn new()->Self{
        Self{
            _private: ()
        }
    }
}

impl MeterProvider for NoopMeterProvider{
    fn meter_with_scope(&self, scope: InstrumentationScope) -> Meter {
        Meter::new(Arc::new(NoopMeter::new()))
    }
}

struct NoopMeter {
    _private: (),
}

impl NoopMeter {
    /// Create a new no-op meter core.
    fn new() -> Self {
        NoopMeter { _private: () }
    }
}

impl InstrumentProvider for NoopMeter {}

fn metrics_events(c: &mut Criterion) {
.........

[MathiasPius]

That was also the solution I was considering.

With a maintainer's blessing and some guidance on how to resolve the spec_unstable_metrics_views change, I can make the changes later today :)

[MathiasPius]

I've resolved the caveats in the OP:

• Added implementation of NoopMeterProvider in benches/metrics.rs
• Enabled spec_unstable_metrics_views feature for opentelemetry-sdk (in dev-dependencies only)

[djc]

Thanks for doing the legwork on this!

Would you mind adding a separate commit with a version bump?

[MathiasPius]

• Removed the "views" functionality from the example
• Fixed the cargo hack powerset feature failures, missed some .init() to .build() renames.
• Bumped version to 0.28.0

[djc]

Looks like you'll need to bump the MSRV:

https://github.com/tokio-rs/tracing-opentelemetry/blob/v0.1.x/Cargo.toml#L16
https://github.com/tokio-rs/tracing-opentelemetry/blob/v0.1.x/.github/workflows/CI.yml#L91

(Please make that a separate commit as well.)

[djc]

• Published tracing-opentelemetry v0.28.0 at registry crates-io
• [new tag] v0.28.0 -> v0.28.0
• Release notes

[douggynix]

Thanks