Spans, formed from parallel() step's branches in pipeline, have longer duration than branches themselves

[Artalus]

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What Operating System are you using (both controller, and any agents involved in the problem)?

Master: Linux
Agents: unrelated

Reproduction steps

Tested on a really simple scripted pipeline utilizing parallel() block:

parallel([
    'branch 1': { sleep 1 },
    'branch 2': { sleep 2 },
    'branch 3': { sleep 3 },
    'branch 4': { sleep 4 },
])

OTel results are displayed in Jaeger.

Expected Results

• an encompassing span for the whole parallel() call, with duration of 4+ seconds (longest sleep + setup/teardown)
• under it, 4 more Parallel branch: ... spans, with duration corresponding directly to actual step spans done inside said branch: ~1, ~2, ~3, ~4 seconds

Similar to how the "pipeline steps" page visualizes the pipeline:

Actual Results

Instead there is no single parent span for the parallel(), and all of the branch spans are 5+ seconds instead, aligned by the end of the whole paralllel() call.

Anything else?

No response

Are you interested in contributing a fix?

No response

[kuisathaverat]

The sleep steps have the correct duration, so I guess the parallel task does not return until all the parallel tasks return. It is probably something we cannot do anything about.