Hi! Since yesterday one of our flows has stopped running, it is marked as white in the UI (see screenshot). This is pretty urgent so it would be nice if I could get some quick help!

What's the state of those flow runs ?

I cannot even see the state. If i hover over a flow run i can only see the name of the run

That's really weird indeed. Are you running on Prefect Cloud or Server ?

Prefect cloud

I'm sorry, I can't think of anything that would cause this off the top of my head. You might have to contact the support directly or wait for a Prefect team member to answer here.

Works again now after rebuilding the flow

Glad that it's working again !

@Samuel Tober those white bars may indicate scheduled flow runs that had to be canceled by the Scheduler service due to new flow version. Any time you register a new flow version, the already scheduled flow runs for that flow version have to be cancelled - maybe that's what was indicated by those white bars? if you find more about that in a post-mortem, let us know

We did not create a new version recently so I cannot see how that would be the issue, but I will let you know if we would find the reason 🙂

@Samuel Tober and @Sylvain Hazard and anyone else stumbling upon this issue: the issue you see is a pure UI thing that happens when switching between light and dark mode! I've just found it out from our UI team. So on the backend side everything should work as expected and no need to worry about the white bars - refreshing your screen should sort it out! 🙂

Thanks for the heads ups !

But for us it seems like the flow was never run, we have notifications set up with slack and never received a notification

this must be a separate issue than the white bars thing 😄 you mentioned it's resolved after you reregistered so I'd "close" the thread for now - if something like this happens again and you have some questions about it, let's open another thread 👍

I would say it’s very much related to the white bars. Would be nice to understand why it happened. Really doesn’t seem like a only UI thing for us

@Jesper Hemmingsson the reason I asked about the separate thread for the backend question is that we archive those to Discourse and I already did that for the UI question https://discourse.prefect.io/t/my-flow-runs-have-white-bars-in-the-prefect-ui-what-might-be-the-issue/467 would be nice if you could open a separate thread if the issue still persist - I thought it got resolved after reregistering the flow?

I see. Was note aware about how the threads work. We managed to make the flows run after re-registering, but we still see white bars after that (see the picture). But I’ll create another thread then 🙂

@Jesper Hemmingsson and @Samuel Tober - it's hard to see from the screenshot but it looks like the bars are in a cancelling state? (As Anna suggested above.) You should be able to click on the bar and get taken to its corresponding flow run page. Can you see any more information about your run there?

The darker grey bar is a cancelled run. The other ones are not I think. When I click on one of the light grey / white bars, this is what I see:

Can you show a full UI screen? 😄 the most important part about the flow run state is hidden here

This is all the info we can see in the UI. I cannot hover over the black dots since the zoom/pan box is blocking

Is there anything on the logs tab?

Here is what I meant if you could take a full UI screenshot

This is all info that we can see on the flow runn