const runtime.traceEvGoUnblock

2 uses

	runtime (current package)
		trace.go#L45: 	traceEvGoUnblock         = 21 // goroutine is unblocked [timestamp, goroutine id, seq, stack]
		trace.go#L1122: 		traceEvent(traceEvGoUnblock, skip, uint64(gp.goid), gp.traceseq)