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[GEP-19] Migrate shoot Alertmanager deployment and configuration (gar…
…dener#9257) * Remove memory limits Similar to gardener#9205 * Integrate alertmanager deployment into `Shoot` controller * `Ingress` * Alerting secrets There can only be at most one alerting secret, so we don't need handling for multiple, see https://github.com/gardener/gardener/blob/3867eb16afa1bfe020f464992e7ea3ae445a2389/pkg/utils/gardener/garden.go#L231-L233 * Add explicit network policy label to shoot Prometheus The connection to the shoot alertmanager is implicitly covered by the `to-all-scrape-targets=allowed` label. However, it's better to explicitly allow the connection since it's explicitly configured in the Prometheus config. * Migrate existing shoots early in reconciliation flow This allows that we can drop the "cleanup"/migration code after a couple of releases while it's ensured that all old `alertmanager` `StatefulSet`s have been migrated. * Address PR review feedback
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