reverting optional task for v0.11 [wip]

[Borda]

What does this PR do?

Fixes #1670

Partial revert of #1252 for module-like metrics (not functional)
Facilitate/smooth compatibility before v1.0

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[SkafteNicki]

@Borda I would vote for us closing this PR and corresponding issue.
We have not had any user feedback that the task parameter is difficult to deal with, so I feels like unnecessary work keeping another version alive where it is not.