On the left sidebar, there is only one select box for filter on CDS Tags.

So, what’s a tag? A tag is a CDS Variable, exported as a tag. There are default tags as git.branch, git.hash, triggered_by and environment. For example, if you want to know on which branch the build was launched, you just have to filter on a specific CDS tag (in this case git.branch)

Inside a job, a user can add a Tag with the worker command

worker tag tagKey=tagValue

See worker tag documentation

Tags are useful to add information and context for a run.

If you want to filter all runs in sidebar, you can select the tags displayed: go to Workflow → Advanced → “Tags to display in the sidebar”.