open-telemetry/opentelemetry-rust

i'm trying to use opentelemetry in an existing actix-web application, that already uses tracing to export into jaeger. i try to configure everything like this:

use opentelemetry::{global, runtime::TokioCurrentThread};
use tracing::{subscriber::set_global_default, Subscriber};
use tracing_bunyan_formatter::{BunyanFormattingLayer, JsonStorageLayer};
use tracing_log::LogTracer;
use tracing_subscriber::{layer::SubscriberExt, EnvFilter, Registry};

pub fn get_subscriber(name: &str, env_filter: &str) -> impl Subscriber + Send + Sync {
    let env_filter =
        EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(env_filter));

    let formatting_layer = BunyanFormattingLayer::new(name.to_string(), std::io::stdout);

    global::set_text_map_propagator(opentelemetry_jaeger::Propagator::new());
    let tracer = opentelemetry_jaeger::new_pipeline()
        .with_service_name(name)
        .install_batch(TokioCurrentThread)
        .expect("cannot install jaeger pipeline");
    let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);

    Registry::default()
        .with(telemetry)
        .with(env_filter)
        .with(JsonStorageLayer)
        .with(formatting_layer)
}

pub fn init_subscriber(subscriber: impl Subscriber + Send + Sync) {
    LogTracer::init().expect("Failed to set logger");
    set_global_default(subscriber).expect("Failed to set tracing subscriber");
}

and will later call it init_subscriber(get_subscriber("app_name", "info"))

but this fails because opentelemetry::sdk::trace::Tracer does not implement the following traits: opentelemetry::trace::tracer::Tracer, PreSampledTracer.
i don't know what i'm missing here...