kubernetes/vendor/golang.org/x/tools/internal/event/core/fast.go

// Log1 takes a message and one label delivers a log event to the exporter.
// It is a customized version of Print that is faster and does no allocation.
func Log1(ctx context.Context, message string, t1 label.Label) { … }

// Log2 takes a message and two labels and delivers a log event to the exporter.
// It is a customized version of Print that is faster and does no allocation.
func Log2(ctx context.Context, message string, t1 label.Label, t2 label.Label) { … }

// Metric1 sends a label event to the exporter with the supplied labels.
func Metric1(ctx context.Context, t1 label.Label) context.Context { … }

// Metric2 sends a label event to the exporter with the supplied labels.
func Metric2(ctx context.Context, t1, t2 label.Label) context.Context { … }

// Start1 sends a span start event with the supplied label list to the exporter.
// It also returns a function that will end the span, which should normally be
// deferred.
func Start1(ctx context.Context, name string, t1 label.Label) (context.Context, func()) { … }

// Start2 sends a span start event with the supplied label list to the exporter.
// It also returns a function that will end the span, which should normally be
// deferred.
func Start2(ctx context.Context, name string, t1, t2 label.Label) (context.Context, func()) { … }