Struct OtelLayer 

pub struct OtelLayer;

Middleware that creates an HTTP server span for each request.

• Reads W3C traceparent from the request to continue an existing trace.
• Creates a new trace when no traceparent is present.
• Stores the active span in thread-local storage so downstream middleware (e.g. crate::proxy::ReverseProxy) can propagate it.
• Records the span on the way out with http.method, http.target, and http.status_code attributes.

Requires setup or setup_from_env to be called at startup. Without initialisation the layer is a no-op passthrough.

Trait Implementations

impl Middleware for OtelLayer

fn handle( &self, request: &Request, connection: &ConnectionInfo, next: &dyn Application, ) -> Result<Response, String>