Merge branch 'main' into bump_v175

Author: lalitb

examples/README.md

@@ -7,7 +7,7 @@ This directory contains some examples that should help you get start crates from
 This example uses following crates from this repo:
 
 - opentelemetry(log)
-- opentelemetry-appender-log
+- opentelemetry-appender-tracing
 - opentelemetry-stdout
 
 Check this example if you want to understand *how to instrument logs using opentelemetry*.

examples/metrics-advanced/src/main.rs

@@ -4,7 +4,7 @@ use opentelemetry::KeyValue;
 use opentelemetry_sdk::metrics::{
     Aggregation, Instrument, PeriodicReader, SdkMeterProvider, Stream, Temporality,
 };
-use opentelemetry_sdk::{runtime, Resource};
+use opentelemetry_sdk::Resource;
 use std::error::Error;
 
 fn init_meter_provider() -> opentelemetry_sdk::metrics::SdkMeterProvider {
@@ -49,7 +49,7 @@ fn init_meter_provider() -> opentelemetry_sdk::metrics::SdkMeterProvider {
         .with_temporality(Temporality::Delta)
         .build();
 
-    let reader = PeriodicReader::builder(exporter, runtime::Tokio).build();
+    let reader = PeriodicReader::builder(exporter).build();
     let provider = SdkMeterProvider::builder()
         .with_reader(reader)
         .with_resource(Resource::new([KeyValue::new(

examples/metrics-basic/src/main.rs

@@ -1,6 +1,6 @@
 use opentelemetry::{global, KeyValue};
 use opentelemetry_sdk::metrics::{PeriodicReader, SdkMeterProvider};
-use opentelemetry_sdk::{runtime, Resource};
+use opentelemetry_sdk::Resource;
 use std::error::Error;
 use std::vec;
 
@@ -9,7 +9,7 @@ fn init_meter_provider() -> opentelemetry_sdk::metrics::SdkMeterProvider {
         // Build exporter using Delta Temporality (Defaults to Temporality::Cumulative)
         // .with_temporality(opentelemetry_sdk::metrics::Temporality::Delta)
         .build();
-    let reader = PeriodicReader::builder(exporter, runtime::Tokio).build();
+    let reader = PeriodicReader::builder(exporter).build();
     let provider = SdkMeterProvider::builder()
         .with_reader(reader)
         .with_resource(Resource::new([KeyValue::new(

examples/self-diagnostics/Cargo.toml

@@ -6,15 +6,16 @@ license = "Apache-2.0"
 publish = false
 
 [features]
-default = ["reqwest"]
+default = ["reqwest", "experimental_metrics_periodicreader_with_async_runtime"]
 reqwest = ["opentelemetry-otlp/reqwest-client"]
 hyper = ["opentelemetry-otlp/hyper-client"]
+experimental_metrics_periodicreader_with_async_runtime = ["opentelemetry_sdk/experimental_metrics_periodicreader_with_async_runtime"]
 
 
 [dependencies]
 once_cell = { workspace = true }
 opentelemetry = { path = "../../../opentelemetry" }
-opentelemetry_sdk = { path = "../../../opentelemetry-sdk", features = ["rt-tokio", "metrics", "logs"]}
+opentelemetry_sdk = { path = "../../../opentelemetry-sdk", features = ["rt-tokio", "experimental_metrics_periodicreader_with_async_runtime"]}
 opentelemetry-http = { path = "../../../opentelemetry-http", optional = true, default-features = false}
 opentelemetry-otlp = { path = "../..", features = ["http-proto", "http-json", "logs"] , default-features = false}
 opentelemetry-appender-tracing = { path = "../../../opentelemetry-appender-tracing", default-features = false}

examples/self-diagnostics/README.md

@@ -10,7 +10,7 @@ use opentelemetry_otlp::WithExportConfig;
 use opentelemetry_otlp::{LogExporter, MetricExporter, Protocol, SpanExporter};
 use opentelemetry_sdk::{
     logs::LoggerProvider,
-    metrics::{MetricError, PeriodicReader, SdkMeterProvider},
+    metrics::{MetricError, SdkMeterProvider},
     runtime,
     trace::{self as sdktrace, TracerProvider},
 };
@@ -63,20 +63,25 @@ fn init_metrics() -> Result<opentelemetry_sdk::metrics::SdkMeterProvider, Metric
         .with_endpoint("http://localhost:4318/v1/metrics")
         .build()?;
 
+    #[cfg(feature = "experimental_metrics_periodicreader_with_async_runtime")]
+    let reader =
+        opentelemetry_sdk::metrics::periodic_reader_with_async_runtime::PeriodicReader::builder(
+            exporter,
+            runtime::Tokio,
+        )
+        .build();
+    // TODO: This does not work today. See https://github.com/open-telemetry/opentelemetry-rust/issues/2400
+    #[cfg(not(feature = "experimental_metrics_periodicreader_with_async_runtime"))]
+    let reader = opentelemetry_sdk::metrics::PeriodicReader::builder(exporter).build();
+
     Ok(SdkMeterProvider::builder()
-        .with_reader(PeriodicReader::builder(exporter, runtime::Tokio).build())
+        .with_reader(reader)
         .with_resource(RESOURCE.clone())
         .build())
 }
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
-    let tracer_provider = init_traces()?;
-    global::set_tracer_provider(tracer_provider.clone());
-
-    let meter_provider = init_metrics()?;
-    global::set_meter_provider(meter_provider.clone());
-
     let logger_provider = init_logs()?;
 
     // Create a new OpenTelemetryTracingBridge using the above LoggerProvider.
@@ -115,6 +120,12 @@ async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {
         .with(fmt_layer)
         .init();
 
+    let tracer_provider = init_traces()?;
+    global::set_tracer_provider(tracer_provider.clone());
+
+    let meter_provider = init_metrics()?;
+    global::set_meter_provider(meter_provider.clone());
+
     let common_scope_attributes = vec![KeyValue::new("scope-key", "scope-value")];
     let scope = InstrumentationScope::builder("basic")
         .with_version("1.0")

examples/self-diagnostics/src/main.rs

@@ -7,9 +7,9 @@ publish = false
 
 [dependencies]
 once_cell = { workspace = true }
-opentelemetry = { path = "../../../opentelemetry", features = ["metrics", "logs"] }
-opentelemetry_sdk = { path = "../../../opentelemetry-sdk", features = ["rt-tokio", "logs"] }
-opentelemetry-otlp = { path = "../../../opentelemetry-otlp", features = ["tonic", "metrics", "logs"] }
+opentelemetry = { path = "../../../opentelemetry" }
+opentelemetry_sdk = { path = "../../../opentelemetry-sdk", features = ["rt-tokio"] }
+opentelemetry-otlp = { path = "../../../opentelemetry-otlp" }
 opentelemetry-semantic-conventions = { path = "../../../opentelemetry-semantic-conventions" }
 tokio = { version = "1.0", features = ["full"] }
 opentelemetry-appender-tracing = { path = "../../../opentelemetry-appender-tracing", default-features = false}

opentelemetry-otlp/examples/basic-otlp-http/Cargo.toml

@@ -14,8 +14,16 @@ The example employs a `BatchExporter` for logs and traces, which is the
 recommended approach when using OTLP exporters. While it can be modified to use
 a `SimpleExporter`, this requires the main method to be a `tokio::main` function
 since the `tonic` client requires a Tokio runtime. If you prefer not to use
-`tokio::main`, then the `init_logs`, `init_traces`, and `init_metrics` functions
-must be executed within a Tokio runtime. Below is an example:
+`tokio::main`, then the `init_logs` and `init_traces` functions must be executed
+within a Tokio runtime. 
+
+This examples uses the default `PeriodicReader` for metrics, which uses own
+thread for background processing/exporting. Since the `tonic` client requires a
+Tokio runtime, the main method must be a `tokio::main` function. If you prefer not
+to use `tokio::main`, then the `init_metrics` function must be executed within a
+Tokio runtime.
+
+Below is an example on how to use non `tokio::main`:
 
 ```rust
 fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> {