func On() bool {
	tracer.mu.RLock()
	on := tracer.on
	tracer.mu.RUnlock()
	return on
}
func On() bool {
	tracer.mu.RLock()
	on := tracer.on
	tracer.mu.RUnlock()
	return on
}
func On ( ) bool { tracer . mu . RLock ( ) on := tracer . on tracer . mu . RUnlock ( ) return on }
// On returns if tracing methods output is active.
On returns if tracing methods output is active .