For us it was a lot of simple things. Change management was the biggest pain but in the end it was just an extra step in our build process. Our canary process

For us it was a lot of simple things. Change management was the biggest pain but in the end it was just an extra step in our build process. Our canary process was a bit hands on (find a host, deploy to that host, tcpdump/check logs to validate the changes were correct and in effect). We stopped doing that. I can't decide if we are building better software without that as a crutch or if we are just not seeing production issues. Anyway, it's stuff like that. Little shortcuts here and there. Nothing major, but it required behavioral change within the org.