Module middleware 

Observability middleware for request tracking and metrics.

Provides:

• Request ID generation and propagation
• HTTP metrics collection
• Request/response logging

Structs

RequestId

Request ID extension type.

Constants

REQUEST_ID_HEADER

Header name for request ID.

Functions

metrics_handler

Get metrics endpoint handler.

metrics_layer

Create a metrics layer.

metrics_middleware

Metrics middleware - records HTTP request metrics.

request_id_layer

Create a request ID layer function.

request_id_middleware

Request ID middleware - adds request ID to all requests.

Type Aliases

MetricsLayer

Alias for metrics_layer

MiddlewareLayer

Type alias for the middleware layer.

RequestIdLayer

Alias for request_id_layer