Kubernetes API Monitoring

Kubernetes API Monitoring Rules

The Prometheus agent is configured to report numerous K8s metrics. Below is the YAML-based rule set that Catapult uses, including alert names, expression, timeframe, labels, and annotations which contain the description and summaries.

bash-5.0# cat k8s.yml

groups:

- name: kube-apiserver

rules:

#----------------------------------- API server -------------------------------------

- alert: KubeAPIServerDown

expr: up{job="kube-apiserver"} offset 5m == 0

for: 1m

labels:

severity: critical

type: k8s

annotations:

description: Kubernetes API server down on cluster {{ $labels.cluster }}

summary: "Cluster {{ $labels.cluster }}: Kube api server down on host {{ $labels.host }}"

- alert: KubernetesApiServerErrors

expr: sum(rate(apiserver_request_total{code=~"(4|5).."}[1m] offset 5m )) by (cluster, host) / sum(rate(apiserver_request_total[1m] offset 5m )) by (cluster, host) * 100 > 3

for: 2m

labels:

severity: critical

Last updated by Anagha Pamidi on Jan 27, 2026

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