| Alertname | Severity | Type | Description |
|---|---|---|---|
| ApiServerUnreachableViaKubernetesService | critical | shoot | The Api server has been unreachable for 3 minutes via the kubernetes service in the shoot. |
| KubeletTooManyOpenFileDescriptorsSeed | critical | seed | Seed-kubelet ({{ $labels.kubernetes_io_hostname }}) is using {{ $value }}% of the available file/socket descriptors. Kubelet could be under heavy load. |
| KubePersistentVolumeUsageCritical | critical | seed | The PersistentVolume claimed by {{ $labels.persistentvolumeclaim }} is only {{ printf "%0.2f" $value }}% free. |
| KubePersistentVolumeFullInFourDays | warning | seed | Based on recent sampling, the PersistentVolume claimed by {{ $labels.persistentvolumeclaim }} is expected to fill up within four days. Currently {{ printf "%0.2f" $value }}% is available. |
| KubePodPendingControlPlane | warning | seed | Pod {{ $labels.pod }} is stuck in "Pending" state for more than 30 minutes. |
| KubePodNotReadyControlPlane | warning | Pod {{ $labels.pod }} is not ready for more than 30 minutes. |
|
| PrometheusCantScrape | warning | seed | Prometheus failed to scrape metrics. Instance {{ $labels.instance }}, job {{ $labels.job }}. |
| PrometheusConfigurationFailure | warning | seed | Latest Prometheus configuration is broken and Prometheus is using the previous one. |
| VPNProbeAPIServerProxyFailed | critical | shoot | The API Server proxy functionality is not working. Probably the vpn connection from an API Server pod to the vpn-shoot endpoint on the Shoot workers does not work. |