ident: system identifier generator

This is pretty fast and guarantees uniqueness when initialised correctly.

Signed-off-by: Yonah <contrib@gensokyo.uk>

ident/system.go

@@ -17,17 +17,13 @@ const (
 
 // S represents a unique system identifier.
 type S struct {
-	// Deployment site, typically denoting a datacenter servicing a region.
-	Site uint32
-	// Servicing host behind load balancer, unique within its Site.
-	Host uint32
-
+	PartG
 	// An instant in time, some time after the corresponding system metadata
 	// first appeared to the backend, represented in nanoseconds since
 	// 1970-01-01.
 	Time uint64
 	// Randomly generated value. The implementation must guarantee that the same
-	// value cannot be emitted for a Time value on a servicing Host.
+	// value cannot be emitted for a Time value on a servicing host.
 	ID uint64
 }