Backport: Reduce memory usage of metrics update tasks #4377
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Because the tasks iterated over large datasets (i.e. all projects, or all components of a project), the DataNucleus L1 cache kept growing. Prevent this from happening by evicting objects from the cache after every iteration. Also, because setting a `FetchGroup` on `Query` level doesn't overwrite the `FetchGroup` on `PersistenceManager` level, too many fields were being loaded. Use `ScopedCustomization` to overwrite the PM's `FetchGroup` when querying objects for metrics calculation. Signed-off-by: nscuro <[email protected]>
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Description
Reduces memory usage of metrics update tasks.
Addressed Issue
Backports #4325
Additional Details
N/A
Checklist
This PR fixes a defect, and I have provided tests to verify that the fix is effectiveThis PR implements an enhancement, and I have provided tests to verify that it works as intendedThis PR introduces changes to the database model, and I have added corresponding update logicThis PR introduces new or alters existing behavior, and I have updated the documentation accordingly