Mirantis Container Cloud (MCC) becomes part of Mirantis OpenStack for Kubernetes (MOSK)!

Starting with MOSK 25.2, the MOSK documentation set will cover all product layers, including MOSK management (formerly MCC). This means everything you need will be in one place. The separate MCC documentation site will be retired, so please update your bookmarks for continued easy access to the latest content.

Kubernetes system¶

This section lists the alerts for the Kubernetes system.

For troubleshooting guidelines, see Troubleshoot Kubernetes system alerts.

KubeAPICertExpirationHigh¶

Severity	Critical
Summary	Kubernetes API certificate expires on `{{ $value \| humanizeTimestamp }}`.
Description	The SSL certificate for Kubernetes API expires on `{{ $value \| humanizeTimestamp }}`, less than 10 days are left.

KubeAPICertExpirationMedium¶

Severity	Major
Summary	Kubernetes API certificate expires on `{{ $value \| humanizeTimestamp }}`.
Description	The SSL certificate for Kubernetes API expires on `{{ $value \| humanizeTimestamp }}`, less than 30 days are left.

KubeAPIDown¶

Severity	Critical
Summary	A Kubernetes API endpoint is down.
Description	The `{{ $labels.node }}` Kubernetes API endpoint is not accessible for the last 3 minutes.

KubeAPIErrorsHighMajor¶

Severity	Major
Summary	API server is returning errors for more than 3% of requests.
Description	The `{{ $labels.instance }}` API server is returning errors for `{{ $value }}%` of requests.

KubeAPIErrorsHighWarning¶

Severity	Warning
Summary	API server is returning errors for more than 1% of requests.
Description	The API server is returning errors for `{{ $value }}%` of requests.

KubeAPIOutage¶

Severity	Critical
Summary	Kubernetes API is down.
Description	The Kubernetes API is not accessible for the last 30 seconds.

KubeAPIResourceErrorsHighMajor¶

Severity	Major
Summary	API server is returning errors for 10% of requests.
Description	The `{{ $labels.instance }}` API server is returning errors for `{{ $value }}%` of requests for `{{ $labels.resource }}` `{{ $labels.subresource }}`.

KubeAPIResourceErrorsHighWarning¶

Severity	Warning
Summary	API server is returning errors for 5% of requests.
Description	The `{{ $labels.instance }}` API server is returning errors for `{{ $value }}%` of requests for `{{ $labels.resource }}` `{{ $labels.subresource }}`.

KubeClientCertificateExpirationInOneDay¶

Removed in MCC 2.28.0 (17.3.0 and 16.3.0)

Severity	Critical
Summary	Client certificate expires in 24 hours.
Description	The client certificate used to authenticate to the API server expires in less than 24 hours.

KubeClientCertificateExpirationInSevenDays¶

Removed in MCC 2.28.0 (17.3.0 and 16.3.0)

Severity	Major
Summary	Client certificate expires in 7 days.
Description	The client certificate used to authenticate to the API server expires in less than 7 days.

KubeClientErrors¶

Severity	Warning
Summary	Kubernetes API client has more than 1% of error requests.
Description	The `{{ $labels.instance }}` Kubernetes API server client has `{{ printf "%0.0f" $value }}%` errors.

KubeDNSTargetsOutage¶

Removed in MCC 2.25.0 (17.0.0 and 16.0.0)

Severity	Critical
Summary	CoreDNS Prometheus targets outage.
Description	Prometheus fails to scrape metrics from all CoreDNS endpoints (more than 1/10 failed scrapes).

KubeletTargetDown¶

Severity	Critical
Summary	Kubelet Prometheus target is down.
Description	Prometheus fails to scrape metrics from kubelet on the `{{ $labels.node }}` node (more than 1/10 failed scrapes).

KubeletTargetsOutage¶

Severity	Critical
Summary	Kubelet Prometheus targets outage.
Description	Prometheus fails to scrape metrics from kubelet on all nodes (more than 1/10 failed scrapes).

KubeletTooManyPods¶

Severity	Warning
Summary	kubelet reached 90% of Pods limit.
Description	The kubelet container on the `{{ $labels.node }}` Node is running `{{ $value }}` Pods, nearly 90% of possible allocation.

KubeNodeNotReady¶

Severity	Warning
Summary	Node `{{ $labels.node }}` is not ready.
Description	The `{{ $labels.node }}` Kubernetes has been unready for more than an hour.

KubernetesApiserverTargetsOutage¶

Severity	Critical
Summary	Kubernetes API server Prometheus targets outage.
Description	Prometheus fails to scrape metrics from 2/3 of Kubernetes API server endpoints.

KubernetesMasterAPITargetsOutage¶

Severity	Critical
Summary	Kubernetes master API Prometheus targets outage.
Description	Prometheus fails to scrape metrics from 2/3 of Kubernetes master API nodes.

KubeStateMetricsTargetDown¶

Severity	Critical
Summary	`kube-state-metrics` Prometheus target is down.
Description	Prometheus fails to scrape metrics from the `kube-state-metrics` service.

KubeVersionMismatch¶

Severity	Warning
Summary	Kubernetes components version mismatch.
Description	There are `{{ $value }}` different semantic versions of Kubernetes components running.