add workflow-uuid labels for user runtime pods

[tiborsimko]

Current behaviour

We currently have several Kubernetes pod labels to identify which runtime pods are belonging to which workflow:

• reana-run-dask-workflow-uuid
• reana-run-batch-workflow-uuid
• reana-run-job-workflow-uuid

When Kubernetes cluster admin would like to filter all pods "belonging" to a workflow, the admin needs to seach for all these label variants.

Expected behaviour

Since "workflow UUID" is a concept orthogonal to pods, we can consider harmonising on using workflow-uuid everywhere.

However, note that we rely on full label names in various watchers and logging agents, so beware doing such a change blindly. E.g. we may want not to replace existing label, but simply to add a new workflow-uuid label only.

Notes

This issue is a follow-up from #664.

[iamakamen]

Hello @tiborsimko ,

I'm a new contributor (CS graduate, preparing for CKA) and I would like to work on this issue.

I understand the goal is to add the common workflow-uuid label to the metadata of all user runtime pods while preserving the existing legacy labels. This seems like a great way to improve administrative filtering.

I have forked the repository and begin locating the code.

Could you please assign this issue to me?

I will post a Pull Request within the next few days. Thank you!

[iamakamen]

Hi @tiborsimko,

I have implemented the workflow-uuid label harmonisation across the runtime components. Here is the summary of the changes:

1. Producers (Adding the label):

• reana-workflow-controller: Added workflow-uuid to Batch, Dask, and Interactive Session pods. (feat: add workflow-uuid label to batch, dask, and session pods #668)
• reana-job-controller: Added workflow-uuid to Job pods. (feat: add workflow-uuid label to job pods reana-job-controller#498)

2. Consumer (Using the label):

• reana-server: Updated reana-admin interactive session cleanup to use the new universal label. (refactor: use workflow-uuid label for session cleanup reana-server#755)

Note on Backward Compatibility:
In reana-server, I have updated the lookup to strictly use workflow-uuid to enforce the new standard (mirroring the approach in reanahub/reana-server#754). If backward compatibility for existing running sessions is required for the CLI tool, I can add a fallback lookup to the legacy labels.

Ready for review!