kubernetes/vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/labeler.go

type Labeler …

// Add attributes to a Labeler.
func (l *Labeler) Add(ls ...attribute.KeyValue) { … }

// Get returns a copy of the attributes added to the Labeler.
func (l *Labeler) Get() []attribute.KeyValue { … }

type labelerContextKeyType …

const lablelerContextKey …

// ContextWithLabeler returns a new context with the provided Labeler instance.
// Attributes added to the specified labeler will be injected into metrics
// emitted by the instrumentation. Only one labeller can be injected into the
// context. Injecting it multiple times will override the previous calls.
func ContextWithLabeler(parent context.Context, l *Labeler) context.Context { … }

// LabelerFromContext retrieves a Labeler instance from the provided context if
// one is available.  If no Labeler was found in the provided context a new, empty
// Labeler is returned and the second return value is false.  In this case it is
// safe to use the Labeler but any attributes added to it will not be used.
func LabelerFromContext(ctx context.Context) (*Labeler, bool) { … }