There is a misconception among some forum members that scheduled maintenance of IRCC website will result in PPR rain. PPR comes in the form of email or a message in GCkey account and it can be done on the fly. If there are multiple PPRs to be issued then they can do it through a batch job. They don't need to bring down entire IRCC website down to send out the PPRs.
There was an incident few months ago when a scheduled maintenance resulted into many candidates moving to IP2 on same time but it was a one off situation and many members have confirmed that they saw a terminology change after the maintenance. So we can not conclude that the maintenance was the reason behind bunch of people moving to IP2. You can read more about it here
https://www.canadavisa.com/canada-immigration-discussion-board/threads/27th-feb-ip2s.546173/
In recent past, we have also observed changes like new layout, bio-metric requirement updates etc after scheduled maintenance.
I don't want this to sound discouraging to anyone, just don't want people to have false hopes and adding more to already increasing disappointments when these hopes result into nothing.
There is another misconception about ordering GCMS notes impacting processing times (positively/negatively), this has been clarified many times on this forum and there was a tweet from official handle of IRCC that ordering GCMS notes doesn't impact processing times, check here
https://twitter.com/CitImmCanada/status/1039207796208803841?s=19
Hope we all get our PPRs soon