Show pod names in log view adds undefined prefix

[der-eismann]

Checklist:

• I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• I've included steps to reproduce the bug.
• I've pasted the output of argocd version.

Describe the bug

After upgrading from 2.9.9 to 2.10.5 I wanted to inspect UI changes and tried the Show pod names button in the log view (https://argocd.example.com/applications/argocd/application?view=tree&resource=&node=%2FPod%2Fdefault%2Fapplication-77ffd685cc-hwqtj%2F0&tab=logs). However it always prefixes the pod name in the view with undefined. After checking, I noticed that this issue existed on 2.9.9 already as well.

In some cases, the pod name was displayed in color, e.g. red or blue. However 70% of the time it's white/black (depending on theme) with undefined in front of it. Maybe there is an issue in the code that generates the color of the pod name?

To Reproduce

1. Open application view
2. Click on pod, open Logs tab
3. Click Show pod names button
4. See undefined in front of pod name in some cases

I can't reliably reproduce it, as I said, sometimes the name is colored, sometimes it's not.

Expected behavior

Screenshots

Issue as described:

Sometimes it's working:

Version

argocd: v2.10.5+335875d
  BuildDate: 2024-03-28T15:02:45Z
  GitCommit: 335875d13e018bed6e03873f4742582582964745
  GitTreeState: clean
  GoVersion: go1.21.3
  Compiler: gc
  Platform: linux/amd64

Logs

Couldn't find any

[der-eismann]

I guess the issue is somewhere here, but I don't know how to debug this 😕
https://github.com/argoproj/argo-cd/blob/master/ui/src/app/applications/components/pod-logs-viewer/pod-logs-viewer.tsx#L56-L68

Also it was added in #11030.