Comment 1 for bug 1607814

Logstash query:

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Error%20acquiring%20lock%20for%20resource%5C%22%20tags%3A%5C%22screen-h-eng%5C%22

This seems to be a relatively common error. However, it's notable that we didn't see it at all for ~2.5 days this week, and it started back up yesterday afternoon.