fixing metric of sum operator
metric of sum operator was failing due to domain mismatch when there it is chained with a more complicated operator.
The old module-image for the shared runners will be discontinued on October 31. All users still referencing gitlab-registry.mpcdf.mpg.de/mpcdf/module-image in their CI pipelines need to switch to the new CI images now, see instructions here.
metric of sum operator was failing due to domain mismatch when there it is chained with a more complicated operator.