Fair enough. +1 to ChatOps enabled via StackStorm. Disclosure - I work at StackStorm. What we have seen is that over time event driven automation can play the role of any such opinionated approach to cloud orchestration and even as an alternative to heavy reliance on PAAS layers. Event driven automation like StackStorm tends to err on the side of flexibility (use your own scripts, click together the workflows, do your own IFTTT) whereas solutions like OneOps are more polished out of the box and more focused on a particular pipeline. Having said that - StackStorm for ChatOps and especially remediation is the most common way people adopt StackStorm and that use case is quite different than the Walmart project.
Folks interested in this kind of approach may want to join the Event Driven Automation meet-up in the Bay Area. Facebook is discussing FBAR and hosting an upcoming one (already "sold out"). LinkedIn is speaking at the next one (in SF 6/18) http://www.meetup.com/Auto-Remediation-and-Event-Driven-Auto...