How many builds does jenkins need to run before it has estimated times?

We just updated our Jenkins to v2.207.1 and our build estimation times on pipeline jobs have stopped showing up. Rather than a blue bar that when hovered over shows an estimate, we are now seeing the blue-and-white striped barber pole and an estimation of N/A.

I believe this behavior might be only on pipeline jobs - we have so few freestyle jobs that I haven't seen them run yet.

What logic does Jenkins use to calculate those estimations? How many builds will we need before those times fill back in?

Answer

For freestyle or pipelines? Do you use bleuocean? @030 Pipelines, as said. And yes we do use blueocean but this is not in the BO interface, but in regular jenkins.