Moved to google.golang.org/genproto/googleapis/api/annotations

Fixes #52

vendor/github.com/go-kit/kit/sd/registrar.go

@@ -0,0 +1,13 @@
+package sd
+
+// Registrar registers instance information to a service discovery system when
+// an instance becomes alive and healthy, and deregisters that information when
+// the service becomes unhealthy or goes away.
+//
+// Registrar implementations exist for various service discovery systems. Note
+// that identifying instance information (e.g. host:port) must be given via the
+// concrete constructor; this interface merely signals lifecycle changes.
+type Registrar interface {
+	Register()
+	Deregister()
+}