run_cloud_launcher.sh : generate runtime stats

Similar to run_all.sh (I299c0ab5dc3dea4841e560d8fb95b8f3e7df89f2),
produce a runtime stat for each run of the cloud launcher.

Although it won't directly highlight errors, problems tend to end this
playbook early.  When graphed with grafana, we could have noticed a
large drop in the average runtime which would have suggested a
problem.

Change-Id: I8e5371cbc94e9a803ea5e64ae94aca293b834c73

playbooks/roles/cloud-launcher-cron/tasks/main.yaml

@@ -7,7 +7,7 @@
   cron:
     name: run_cloud_launcher.sh
     state: present
-    job: '/usr/bin/flock -n /var/run/ansible/run_cloud_launcher.lock /bin/bash /opt/system-config/run_cloud_launcher.sh >> /var/log/ansible/run_cloud_launcher_cron.log 2>&1'
+    job: '/usr/bin/flock -n /var/run/ansible/run_cloud_launcher.lock /bin/bash /opt/system-config/run_cloud_launcher.sh -c >> /var/log/ansible/run_cloud_launcher_cron.log 2>&1'
     minute: "{{ cloud_launcher_cron_interval.minute }}"
     hour: "{{ cloud_launcher_cron_interval.hour }}"
     day: "{{ cloud_launcher_cron_interval.day }}"

run_cloud_launcher.sh

@@ -27,6 +27,21 @@ ANSIBLE_PLAYBOOKS=$SYSTEM_CONFIG/playbooks
 # errexit
 set +e
 
+# We only send stats if running under cron
+UNDER_CRON=0
+
+while getopts ":c" arg; do
+    case $arg in
+        c)
+            UNDER_CRON=1
+            ;;
+    esac
+done
+
+_START_TIME=$(date '+%s')
+
+echo "--- begin run @ $(date -Is) ---"
+
 # We need access to all-clouds
 export OS_CLIENT_CONFIG_FILE=/etc/openstack/all-clouds.yaml
 
@@ -35,3 +50,15 @@ export OS_CLIENT_CONFIG_FILE=/etc/openstack/all-clouds.yaml
 /usr/bin/timeout -k 2m 120m /usr/local/bin/ansible-playbook -i /dev/null -f 1 \
     ${ANSIBLE_PLAYBOOKS}/run_cloud_launcher.yaml \
     -e@${ANSIBLE_PLAYBOOKS}/clouds_layouts.yml
+
+echo "--- end run @ $(date -Is) ---"
+
+# Only send stats under cron conditions
+if [[ ${UNDER_CRON} != 1 ]]; then
+    return
+fi
+
+_CURRENT_TIME=$(date '+%s')
+_ELAPSED_MS=$(( (_CURRENT_TIME - _START_TIME) * 1000 ))
+echo "bridge.ansible.run_cloud_launcher:${_ELAPSED_MS}|ms" | \
+    nc -w 1 -u graphite.openstack.org 8125