Veronika Volokitina

metrics: add route validation metrics to track processing success/failure rates

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### New Metrics Added **Prometheus metrics:** - `skipper_route_valid_routes` (counter) - Total number of successfully processed routes - `skipper_route_invalid_routes{reason}` (counter) - Total number of invalid routes with failure reason labels **CodaHale...

metrics: remove invalid routes deletion

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When validation is enabled and a new invalid route is created, it gets rejected and a metric is emitted. But when the route is later fixed, the old metric is...

Currently, our validation testdata primarily focuses on failure scenarios caused by technical debt in an early PR of the validation webhook. While these tests demonstrate how validation fails, they don’t...

### Background Skipper’s Kubernetes cluster client currently performs only basic validation when fetching Ingress and RouteGroup resources from the cluster. This leads to inconsistencies between what the admission webhook validates...