Adds a tag on the current span

• :k tag name
• :v tag value. Natively supported types are long, bool or string

See add-tag`.

• :tags a hash of key-value pairs you’d pass to add-tag.

Configure the underlying tracer. Takes

• :probability
• :max-annotations
• :max-attributes
• :max-links
• :max-message-events

all of which are proxied through to the TraceParams class.

Produces B3 style headers for the current span, to be passed down into further RPCs for distributed tracing.

Creates a traced span. Takes a name and a form to be traced, or, additionally, a remote SpanContext that is a remote parent of the one you’re starting.

It is expected that clients should mostly use the 2-arg form and the 3-ard form is called from the Ring middleware handling the deserialization of the context from B3 headers, however, if you’re not using Ring, this might be useful.