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monitoring: Elaborate more about operator

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Lauri Võsandi 2024-08-12 22:15:32 +03:00
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monitoring/README.md
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## Monitoring
## Monitoring namespace
Prometheus is accessible at [prom.k-space.ee](https://prom.k-space.ee/)
and the corresponding AlertManager is accessible at [am.k-space.ee](https://am.k-space.ee/).
Both are [deployed by ArgoCD](https://argocd.k-space.ee/applications/monitoring)
from this Git repo directory using Prometheus operator.
Alerts are sent to #kube-prod Slack channel
Note that Prometheus and other monitoring stack components should use the
`dedicated: monitoring` Kubernetes node selector to make sure the components
get scheduled on `mon[1-3]` nodes which are hosted in a privileged VLAN where
they have access to UPS SNMP targets, Mikrotik router/switch API-s etc.
To add monitoring targets inside the Kubernetes cluster make use of
[PodMonitor](https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/user-guides/getting-started.md#using-podmonitors) or ServiceMonitor custom
resource definitions.
For external targets (ab)use the Probe CRD as seen in `node-exporter.yaml`
or `ping-exporter.yaml`
Alerts are sent to #kube-prod Slack channel. The alerting rules are automatically
picked up by Prometheus operator via Kubernetes manifests utilizing
the operator's
[PrometheusRule](https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/user-guides/alerting.md#deploying-prometheus-rules) custom resource definitions.
Sample queries: