[ui] Logs from other tasks in same group interleaved in logs view

[Legogris]

Nomad version

Nomad v0.12.1 (14a6893a250fc5f652eee4c7b52d8f95c3185aef)

Issue

When viewing the logs for a task, intermittently the logs will be replaced by those of a different task in the same group.

Reproduction steps

1. Schedule job with one task group containing two different tasks using driver docker. No specific configuration for logging in either client or job spec.
2. Enter log view in Web UI

[rkettelerij]

I haven't yet tried to reproduce this bug. But if it's correct (I assume so) then it sounds like a serious regression. Especially because having multiple tasks per group is rather common in my experience. The 0.11.x line doesn't show this behaviour, of that I'm sure. /cc @backspace @DingoEatingFuzz

[DingoEatingFuzz]

I haven't tried to reproduce this yet either, but I'm also not sure how this could be a UI issue. I'm surprised by software every day, so I'm not saying it isn't a UI bug, but I'd be curious to see if anyone can reproduce it via the CLI or API.

[Legogris]

I guess "interleaved" was a not a great choice of words; the UI kind of "blinks" when it happens and there's only ever one tasks' is visible at any point in time.

I have not confirmed the causality but it seems to mostly or only happen when tasks/containers restart or get rescheduled.

I have not yet observed this in the cli, though I haven't had it open when it triggers in the UI.

[rkettelerij]

I was under the impression that logs would get mixed together, all of the time. Great to hear that's not the case.

@Legogris Perhaps an animated gif that demonstrates the issue would help clarify things?

[DingoEatingFuzz]

I'm surprised by software every day, so I'm not saying it isn't a UI bug

So to my mild surprise, it was a UI bug. PR open: #8833

[github-actions]

I'm going to lock this issue because it has been closed for 120 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.