open-telemetry/opentelemetry-rust

hey all, i am running this example here

fn init_meter() -> metrics::Result<PushController> {
    let export_config = ExporterConfig {
        endpoint: "http://localhost:4317".to_string(),
        protocol: Protocol::Grpc,
        ..ExporterConfig::default()
    };
    opentelemetry_otlp::new_metrics_pipeline(tokio::spawn, delayed_interval)
        .with_export_config(export_config)
    .with_aggregator_selector(selectors::simple::Selector::Exact)
        .build()
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
    let _started = init_meter()?;
    let meter = global::meter("test2");
    let value_counter = meter.u64_counter("blah9").init();   
    let labels = vec![KeyValue::new("key1","val1")];
    for i in 0..100{
    let j = i%4;
    println!("{} {}",i,j);
    let mut labels = vec![];//labels.clone();
    let kv = match j{
        0=> KeyValue::new("method","GET"),
        1=> KeyValue::new("method","POST"),
        2=> KeyValue::new("method","PUT"),
        3=> KeyValue::new("method","DELETE"),
        _=> KeyValue::new("method","HEAD"),
    };
    labels.push(kv);
//    labels.push(KeyValue::new("key4",j.to_string()));

    value_counter.add(1, &labels);
    tokio::time::sleep(Duration::from_secs(1)).await;
    }

    // wait for 1 minutes so that we could see metrics being pushed via OTLP every 10 seconds.
    tokio::time::sleep(Duration::from_secs(60)).await;

    shutdown_tracer_provider();

    Ok(())
}

At the end, in Prometheus dashboard I am getting

agent_blah9{collector="pf", instance="otel-agent:8889", job="otel-collector", method="PUT", type="docker"}   25

where I would expect

agent_blah9{collector="pf", instance="otel-agent:8889", job="otel-collector", method="PUT", type="docker"}   25
agent_blah9{collector="pf", instance="otel-agent:8889", job="otel-collector", method="POST", type="docker"}   25
agent_blah9{collector="pf", instance="otel-agent:8889", job="otel-collector", method="GET", type="docker"}   25
agent_blah9{collector="pf", instance="otel-agent:8889", job="otel-collector", method="DELETE", type="docker"}   25

Any ideas ? I had a look at agent opentelemetry-agent logs and there seems to be only one type of metric there

Data point labels:
     -> method: PUT