Revert "Allow precreation of AttributeSets for metrics (open-telemetr…

…y#1421)"

This reverts commit 16fd1ab.

examples/metrics-basic/src/main.rs

@@ -1,5 +1,4 @@
 use opentelemetry::metrics::Unit;
-use opentelemetry::AttributeSet;
 use opentelemetry::{metrics::MeterProvider as _, KeyValue};
 use opentelemetry_sdk::metrics::{PeriodicReader, SdkMeterProvider};
 use opentelemetry_sdk::{runtime, Resource};
@@ -53,10 +52,11 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
         observer.observe_u64(
             &observable_counter,
             100,
-            AttributeSet::from(&[
+            [
                 KeyValue::new("mykey1", "myvalue1"),
                 KeyValue::new("mykey2", "myvalue2"),
-            ]),
+            ]
+            .as_ref(),
         )
     })?;
 
@@ -84,10 +84,11 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
         observer.observe_i64(
             &observable_up_down_counter,
             100,
-            AttributeSet::from(&[
+            [
                 KeyValue::new("mykey1", "myvalue1"),
                 KeyValue::new("mykey2", "myvalue2"),
-            ]),
+            ]
+            .as_ref(),
         )
     })?;
 
@@ -141,10 +142,11 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
         observer.observe_f64(
             &observable_gauge,
             1.0,
-            AttributeSet::from(&[
+            [
                 KeyValue::new("mykey1", "myvalue1"),
                 KeyValue::new("mykey2", "myvalue2"),
-            ]),
+            ]
+            .as_ref(),
         )
     })?;
 

opentelemetry-otlp/examples/basic-otlp-http/src/main.rs

@@ -11,7 +11,6 @@ use opentelemetry_sdk::metrics as sdkmetrics;
 use opentelemetry_sdk::resource;
 use opentelemetry_sdk::trace as sdktrace;
 
-use opentelemetry::AttributeSet;
 use std::error::Error;
 use tracing::info;
 use tracing_subscriber::prelude::*;
@@ -63,13 +62,13 @@ fn init_metrics() -> metrics::Result<sdkmetrics::SdkMeterProvider> {
 const LEMONS_KEY: Key = Key::from_static_str("ex.com/lemons");
 const ANOTHER_KEY: Key = Key::from_static_str("ex.com/another");
 
-static COMMON_ATTRIBUTES: Lazy<AttributeSet> = Lazy::new(|| {
-    AttributeSet::from(&[
+static COMMON_ATTRIBUTES: Lazy<[KeyValue; 4]> = Lazy::new(|| {
+    [
         LEMONS_KEY.i64(10),
         KeyValue::new("A", "1"),
         KeyValue::new("B", "2"),
         KeyValue::new("C", "3"),
-    ])
+    ]
 });
 
 #[tokio::main]
@@ -105,7 +104,7 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
     info!(target: "my-target", "hello from {}. My price is {}", "apple", 1.99);
 
     let histogram = meter.f64_histogram("ex.com.two").init();
-    histogram.record(5.5, COMMON_ATTRIBUTES.clone());
+    histogram.record(5.5, COMMON_ATTRIBUTES.as_ref());
 
     global::shutdown_tracer_provider();
     global::shutdown_logger_provider();

opentelemetry-otlp/examples/basic-otlp/src/main.rs

@@ -4,7 +4,6 @@ use opentelemetry::global;
 use opentelemetry::global::{logger_provider, shutdown_logger_provider, shutdown_tracer_provider};
 use opentelemetry::logs::LogError;
 use opentelemetry::trace::TraceError;
-use opentelemetry::AttributeSet;
 use opentelemetry::{
     metrics,
     trace::{TraceContextExt, Tracer},
@@ -73,13 +72,13 @@ fn init_logs() -> Result<opentelemetry_sdk::logs::Logger, LogError> {
 const LEMONS_KEY: Key = Key::from_static_str("lemons");
 const ANOTHER_KEY: Key = Key::from_static_str("ex.com/another");
 
-static COMMON_ATTRIBUTES: Lazy<AttributeSet> = Lazy::new(|| {
-    AttributeSet::from(&[
+static COMMON_ATTRIBUTES: Lazy<[KeyValue; 4]> = Lazy::new(|| {
+    [
         LEMONS_KEY.i64(10),
         KeyValue::new("A", "1"),
         KeyValue::new("B", "2"),
         KeyValue::new("C", "3"),
-    ])
+    ]
 });
 
 #[tokio::main]
@@ -110,11 +109,11 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
         .init();
 
     meter.register_callback(&[gauge.as_any()], move |observer| {
-        observer.observe_f64(&gauge, 1.0, COMMON_ATTRIBUTES.clone())
+        observer.observe_f64(&gauge, 1.0, COMMON_ATTRIBUTES.as_ref())
     })?;
 
     let histogram = meter.f64_histogram("ex.com.two").init();
-    histogram.record(5.5, COMMON_ATTRIBUTES.clone());
+    histogram.record(5.5, COMMON_ATTRIBUTES.as_ref());
 
     tracer.in_span("operation", |cx| {
         let span = cx.span();

opentelemetry-prometheus/examples/hyper.rs

@@ -4,7 +4,6 @@ use hyper::{
     Body, Method, Request, Response, Server,
 };
 use once_cell::sync::Lazy;
-use opentelemetry::AttributeSet;
 use opentelemetry::{
     metrics::{Counter, Histogram, MeterProvider as _, Unit},
     KeyValue,
@@ -15,8 +14,7 @@ use std::convert::Infallible;
 use std::sync::Arc;
 use std::time::SystemTime;
 
-static HANDLER_ALL: Lazy<AttributeSet> =
-    Lazy::new(|| AttributeSet::from(&[KeyValue::new("handler", "all")]));
+static HANDLER_ALL: Lazy<[KeyValue; 1]> = Lazy::new(|| [KeyValue::new("handler", "all")]);
 
 async fn serve_req(
     req: Request<Body>,
@@ -25,7 +23,7 @@ async fn serve_req(
     println!("Receiving request at path {}", req.uri());
     let request_start = SystemTime::now();
 
-    state.http_counter.add(1, HANDLER_ALL.clone());
+    state.http_counter.add(1, HANDLER_ALL.as_ref());
 
     let response = match (req.method(), req.uri().path()) {
         (&Method::GET, "/metrics") => {
@@ -35,7 +33,7 @@ async fn serve_req(
             encoder.encode(&metric_families, &mut buffer).unwrap();
             state
                 .http_body_gauge
-                .record(buffer.len() as u64, HANDLER_ALL.clone());
+                .record(buffer.len() as u64, HANDLER_ALL.as_ref());
 
             Response::builder()
                 .status(200)
@@ -55,7 +53,7 @@ async fn serve_req(
 
     state.http_req_histogram.record(
         request_start.elapsed().map_or(0.0, |d| d.as_secs_f64()),
-        AttributeSet::default(),
+        &[],
     );
     Ok(response)
 }

opentelemetry-prometheus/src/lib.rs

@@ -3,14 +3,13 @@
 //! [Prometheus]: https://prometheus.io
 //!
 //! ```
-//! use opentelemetry::{AttributeSet, metrics::MeterProvider, KeyValue};
+//! use opentelemetry::{metrics::MeterProvider, KeyValue};
 //! use opentelemetry_sdk::metrics::SdkMeterProvider;
 //! use prometheus::{Encoder, TextEncoder};
 //!
 //! # fn main() -> Result<(), Box<dyn std::error::Error>> {
 //!
 //! // create a new prometheus registry
-//! use opentelemetry::AttributeSet;
 //! let registry = prometheus::Registry::new();
 //!
 //! // configure OpenTelemetry to use this registry
@@ -32,10 +31,8 @@
 //!     .with_description("Records values")
 //!     .init();
 //!
-//! let attributes = AttributeSet::from(&[KeyValue::new("key", "value")]);
-//!
-//! counter.add(100, attributes.clone());
-//! histogram.record(100, attributes);
+//! counter.add(100, &[KeyValue::new("key", "value")]);
+//! histogram.record(100, &[KeyValue::new("key", "value")]);
 //!
 //! // Encode data as text or protobuf
 //! let encoder = TextEncoder::new();