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Issue
With #370 implemented, now wildcard targets are expanded to individual jobs.
However, the provider's constructor currently takes a hostname rather than a url, and (ingress) path cannot be inferred.
Solution
Change the provider constructor to take a url. This is a non-breaking change because prometheus_scrape wasn't published since the
external_hostname
arg was introduced.Context
Depends on #370.
Testing Instructions
Afaict, existing utests and itest provide sufficient coverage.
Release Notes
Add support for a custom metrics path per unit.