feat: Implement process context publishing (OTEP-4719)

Cargo.toml

@@ -32,6 +32,8 @@ pin-project-lite = "0.2"
 prost = "0.14"
 rand = { version = "0.9", default-features = false }
 reqwest = { version = "0.13.1", default-features = false }
+rustix = { version = "1.1.4", default-features = false }
+serial_test = "3"
 serde = { version = "1.0", default-features = false }
 serde_json = "1.0"
 temp-env = "0.3.6"
@@ -67,6 +69,7 @@ opentelemetry-appender-tracing = { path = "opentelemetry-appender-tracing", vers
 opentelemetry-http = { path = "opentelemetry-http", version = "0.32", default-features = false }
 opentelemetry-jaeger-propagator = { path = "opentelemetry-jaeger-propagator", version = "0.32", default-features = false }
 opentelemetry-otlp = { path = "opentelemetry-otlp", version = "0.32", default-features = false }
+opentelemetry-context = { path = "opentelemetry-context", version = "0.32", default-features = false }
 opentelemetry-proto = { path = "opentelemetry-proto", version = "0.32", default-features = false }
 opentelemetry-semantic-conventions = { path = "opentelemetry-semantic-conventions", version = "0.32", default-features = false }
 opentelemetry-stdout = { path = "opentelemetry-stdout", version = "0.32", default-features = false }

examples/logs-advanced/Cargo.toml

@@ -19,3 +19,4 @@ opentelemetry-appender-tracing = { workspace = true }
 tracing = { workspace = true, features = ["std"]}
 tracing-subscriber = { workspace = true, features = ["env-filter","registry", "std", "fmt"] }
 opentelemetry = { workspace = true }
+opentelemetry-context = { workspace = true }

examples/logs-advanced/src/main.rs

@@ -8,14 +8,19 @@ use tracing::{error, info};
 use tracing_subscriber::{prelude::*, EnvFilter};
 
 fn main() {
+    let resource = Resource::builder()
+        .with_service_name("log-appender-tracing-example")
+        .build();
+
+    // Publish resource attributes via a memory-mapped region so external readers
+    // (e.g. the OpenTelemetry eBPF Profiler) can discover this process.
+    // This is a no-op on non-Linux platforms.
+    opentelemetry_context::process_context::publish(&resource);
+
     let exporter = opentelemetry_stdout::LogExporter::default();
     let enriching_processor = EnrichmentLogProcessor::new(SimpleLogProcessor::new(exporter));
     let provider: SdkLoggerProvider = SdkLoggerProvider::builder()
-        .with_resource(
-            Resource::builder()
-                .with_service_name("log-appender-tracing-example")
-                .build(),
-        )
+        .with_resource(resource)
         .with_log_processor(enriching_processor)
         .build();
 
@@ -55,6 +60,8 @@ fn main() {
     info!(name: "my-event-name", target: "my-system", event_id = 20, user_name = "otel", user_email = "otel@opentelemetry.io", message = "This is an example message");
     error!(name: "my-event-name", target: "my-system", event_id = 50, user_name = "otel", user_email = "otel@opentelemetry.io", message = "This is an example message");
     let _ = provider.shutdown();
+
+    opentelemetry_context::process_context::unpublish();
 }
 
 /// A log processor that enriches log records with additional attributes before

opentelemetry-context/CHANGELOG.md

@@ -0,0 +1,5 @@
+# Changelog
+
+## vNext
+
+- **Feature**: Add process context sharing support ([OTEP-4719](https://github.com/open-telemetry/oteps/pull/4719)). Publishes SDK resource attributes via a named memory mapping on Linux, enabling external readers such as the OpenTelemetry eBPF Profiler to discover process metadata.

opentelemetry-context/Cargo.toml

@@ -0,0 +1,39 @@
+[package]
+name = "opentelemetry-context"
+version = "0.32.0"
+description = "OpenTelemetry context sharing mechanisms."
+homepage = "https://github.com/open-telemetry/opentelemetry-rust/tree/main/opentelemetry-context"
+repository = "https://github.com/open-telemetry/opentelemetry-rust/tree/main/opentelemetry-context"
+readme = "README.md"
+categories = [
+    "development-tools::debugging",
+    "development-tools::profiling",
+    "asynchronous",
+]
+keywords = ["opentelemetry", "context", "profiling", "process"]
+license = "Apache-2.0"
+edition = "2021"
+rust-version = "1.75.0"
+autotests = false
+autobenches = false
+
+[lib]
+doctest = false
+bench = false
+
+[dependencies]
+opentelemetry = { workspace = true, default-features = false }
+opentelemetry_sdk = { workspace = true, default-features = false }
+opentelemetry-proto = { workspace = true, default-features = false, features = ["gen-tonic-messages"] }
+prost = { workspace = true }
+rustix = { workspace = true, features = ["mm", "fs", "process", "time"] }
+
+[dev-dependencies]
+serial_test = { workspace = true }
+
+[features]
+default = ["internal-logs"]
+internal-logs = ["opentelemetry/internal-logs"]
+
+[lints]
+workspace = true

opentelemetry-context/README.md

@@ -0,0 +1,3 @@
+# OpenTelemetry Context
+
+Context sharing mechanisms for OpenTelemetry Rust.

opentelemetry-context/src/lib.rs

@@ -0,0 +1,4 @@
+#![cfg_attr(docsrs, feature(doc_cfg))]
+//! OpenTelemetry context sharing mechanisms.
+
+pub mod process_context;