core: Windows service integration (#4790)

Co-authored-by: Matthew Holt <mholt@users.noreply.github.com>

notify/notify_linux.go

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// Package notify provides facilities for notifying process managers
+// of state changes, mainly for when running as a system service.
 package notify
 
 import (