@jrhop I did receive an email telling me they had scheduled the update, and those scheduled networks were also displaying the banner, so in fairness to Meraki, yes the relevent notification and opportunity to cancel or change the date if desired
It was just my surprise that they had scheduled SRC at all, but upon reading the documentation, it would appear to be the standard practice...
Stable Release Candidate
As a new firmware version matures from beta, it has the opportunity to graduate into a stable release candidate. A formal review of the beta firmware success is conducted by our software and product teams. KPIs for quantifying firmware quality are analyzed including open support cases & engineering issues, firmware adoption, and stability metrics. After the formal review a beta may be reclassified as a "Stable Release Candidate". At this point the firmware version will be indicated as such in the firmware upgrade tool. Once a new stable release candidate is available, Engineering will begin scheduling a limited set of customers for upgrade. These upgrades can be canceled, modified, or reverted using the firmware upgrade tool on dashboard.