In some cases, Salt states fail to be applied on routers after an upgrade to 5.6.16+, 6.1.12+, 6.2.8+, and 6.3.x-r2+. This will impact any salt states that rely on the CentOS name to detect or conditionally perform operations on the SSR.
For example, the following top.sls would be impacted:
base:
  '*':
    - dummy
  'os:CentOS':
    - match: grain
    - centos_example