HTML will trace the rendering of the template as a child of the span in the given context.

Middleware returns middleware that will trace requests with the default tracer.

MiddlewareTracer returns middleware that will trace requests with the given tracer.

NewChildSpan will create a span that is the child of the span stored in the context.

Span returns the Span stored in the given Context and true.

SpanDefault returns the span stored in the given Context.