feat: Implement process context publishing (OTEP-4719)

Cargo.toml

@@ -35,6 +35,8 @@ 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"

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-proto = { workspace = true, features = ["process-context"] }

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_proto::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_proto::process_context::unpublish();
 }
 
 /// A log processor that enriches log records with additional attributes before

opentelemetry-proto/CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Update proto definitions to v1.10.0.
 - Updated `schemars` dependency to version 1.0.0.
+- **Feature**: Add process context sharing support behind `process-context` feature flag ([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.
 
 ## 0.31.0
 

opentelemetry-proto/Cargo.toml

@@ -44,6 +44,7 @@ metrics = ["opentelemetry/metrics", "opentelemetry_sdk/metrics"]
 logs = ["opentelemetry/logs", "opentelemetry_sdk/logs"]
 zpages = ["trace"]
 profiles = []
+process-context = ["gen-tonic-messages", "rustix"]
 testing = ["opentelemetry/testing"]
 
 # add ons
@@ -61,12 +62,14 @@ schemars = { workspace = true, optional = true }
 serde = { workspace = true, optional = true, features = ["serde_derive", "std"] }
 const-hex = { workspace = true, optional = true }
 base64 = { workspace = true, optional = true }
+rustix = { workspace = true, optional = true, features = ["mm", "fs", "process", "time"] }
 
 [dev-dependencies]
 opentelemetry = { workspace = true, features = ["testing"] }
 tonic-prost-build = { workspace = true }
 tempfile = { workspace = true }
 serde_json = { workspace = true }
+serial_test = { workspace = true }
 
 [lints]
 workspace = true

opentelemetry-proto/src/lib.rs

@@ -36,3 +36,6 @@ mod proto;
 pub use proto::tonic;
 
 pub mod transform;
+
+#[cfg(feature = "process-context")]
+pub mod process_context;