We validated yesterday (Sunday) and everything was fine.
Got pulled in to an incident call this morning for an environment that's been having some issues recently.
Newly acquired company that (very obviously) has not yet been fully integrated into the culture of ownership that we have.
Multiple incidents in the last few weeks, and it's always "No, the changes we made *can't* be the problem".
This morning, it was "we added some servers to the environment yesterday (Sunday), but we evaluated everything, and there were no issues, so that's not the problem"
Because yeah, Sunday afternoon in a regular 9x5 business is a perfect fucking example of normal conditions, so when everything works fine then, it's obviously going to be exactly how the environment will behave on Monday morning.
And also "nothing else changed" also apparently includes some code changes that went in over the weekend. But obviously that won't affect anything.