add an upstart init job that logs shutdowns and reboots.

upstart/cloud-log-shutdown.conf

@@ -0,0 +1,18 @@
+# log shutdowns and reboots to the console (/dev/console)
+# this is useful for correlating logs
+start on runlevel PREVLEVEL=2
+
+task
+console output
+
+script
+  # runlevel(7) says INIT_HALT will be set to HALT or POWEROFF
+  date=$(date --utc)
+  case "$RUNLEVEL:$INIT_HALT" in
+     6:*)        mode="reboot";;
+     0:HALT)     mode="halt";;
+     0:POWEROFF) mode="poweroff";;
+     0:*)        mode="shutdown-unknown";;
+  esac
+  echo "$date: shutting down for $mode"
+end script