Hi there. We are having some issues getting flow concurrency limits to work in our set up. This is what we have: • Single docker agent started with two labels: 

restricted

 and 

unrestricted

• The 

restricted

 label in Prefect Cloud has a concurrency limit of 1 • The 

unrestricted

 label does not have any concurrency limits • Some flows have the 

restricted

 label and the rest have the

unrestricted

label • The idea is to be able to run at most one 

restricted

 flow at a time and allow the 

unrestricted

 flows to use all available slots (we have 2 slots at the moment) The concurrency limit is working. Only one 

restricted

 flow runs at a time. The problem is that 

unrestricted

 flows don't start while there is a 

restricted

 flow running. Any ideas? Could you help troubleshoot? edit: if we start the

unrestricted

flow first and the

restricted

flow second both run, but if the

restricted

flow starts first the other doesn't run

Hi Pedro! Thanks for the detailed analysis - there is a chance this is a bug; could you spin up two Docker agents, one with the

restricted

label and one with the

unrestricted

label and let me know if the behavior is any different?

Great! We can test tomorrow. Just let me know.

The fix has been released - let me know if it resolved the issue whenever is convenient