We're currently using M5 for openstack, striker, and wikitech.
The motivation for moving OpenStack services off of M5 are largely related to openstack having unusual database behavior that's ill-suited for the standard practices of wiki-hosting databases. That probably doesn't apply as much to Striker, which I expect acts more like a 'normal' web app. Can it stay on M5? Or is it on the verge of moving to k8s and using toolsdb?
I don't have any plans to move wikitech onto Galera, instead banking on T167973.