Module http_metrics 

HTTP server metrics middleware (OpenTelemetry Semantic Conventions).

Records two instruments per request:

• http.server.request.duration — histogram (seconds)
• http.server.active_requests — up-down counter

Attributes follow OpenTelemetry HTTP semantic conventions: http.request.method, http.route, http.response.status_code.

Structs

HttpMetrics

Holds the two OpenTelemetry instruments for HTTP server metrics.

Functions

http_metrics_middleware

Axum middleware that records HTTP server metrics.

propagate_matched_path

Tiny route_layer that copies MatchedPath into response extensions so that outer layer() middleware (e.g. metrics) can read the route template.