fix: implement ConfigDiscoveryHook for PrometheusOverride to enable OPA status metrics #3851
+88
−19
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What & Why?
Implement ConfigDiscoveryHook.OnConfigDiscovery() for PrometheusOverride to enable Prometheus status metrics when using discovery bundles.
#3631 added support to also expose native OPA metrics via Skipper's metrics endpoint. This PR extends it by also ensuring that we also enable it when using discovery bundles
TODO: Extract some reusable methods if this is the way we want to go