Concurrent monitoring allows you to run a number of monitor checks from different checkpoints for the same monitor at the same time. This results in a quicker and more reliable conclusion whether an error can be regarded a confirmed error.
This feature has been in beta, but is now officially available. All customers with a Business or Enterprise subscription have access to Concurrent monitoring.
For an overview what it is about, please check out this feature overview.
If you want to find out more details about Concurrent monitoring, like how it compares to standard monitoring, which output to expect and more, check out How does Concurrent monitoring work?