Reduce noise created by duplicated trace migration workers
What does this MR do?
This merge request changes the behavior of a build chunk migration code. Instead of raising an exception we increment a trace metric to reduce noise created by this exception. The exception itself is expected because we know we are scheduling a lot of redundant workers. This problem is going to be solved once !42223 (merged) is complete.
We also added a bit more comprehensive description of each label we are using with gitlab_ci_trace_operations_total
counter.
Conformity
Issue
See #263420 (closed)
Edited by Grzegorz Bizon