In recent times our balancers have been fluctuating to keep up the capacity. So, we had to make a few adjustments to assist with the full functionality of our service to you.
We have been forced to limit the functionality of replit.co monitors and run them in “keep-alive-only” mode.
Keep-alive mode
That means you are still able to run these monitors and keep alive your replits. 
However, we do no not check for their status and neither send you any notifications of their incidents.
If you need to check the status and be notified about incidents, we suggest upgrading to our PRO Plan as it provides the full functionality even for these problematic / high volatility domains.
This is no fault of anyone, just the commitment to offer our service on a broader spectrum to your needs.
