Memento metri

Description

The core now remembers the metrics of the last workers, storing it in the settings so the next time it runs, assignments can be created without connected workers.

Changes

• Change the core so that it kills connected workers on shutdown

Additions

• Core will now remember metrics

Test and Review

To be filled in by the reviewers

• All of the methods are commented to expectation

• The methods are tested to satisfaction

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date

• All nullable parameters are marked as such