Allow additional method of gathering web metrics
What does this MR do?
This introduces that is run in context of master process:
gitlab:
monitoring:
web_exporter:
# enabled: true
# address: localhost
# port: 3808
On worker restart we shutdown the exporter.
Related to #30037 (closed) and #30201 (comment 224452030).
Does this MR meet the acceptance criteria?
Conformity
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