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42 lines
1.9 KiB
Plaintext
42 lines
1.9 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * observability/monitoring/shiftstack-prometheus-configuration.adoc
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:_mod-docs-content-type: CONCEPT
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[id="monitoring-shiftstack-metrics_{context}"]
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= Available metrics for clusters that run on RHOSO
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To query metrics and identifying resources across the stack, there are helper metrics that establish a correlation between {rhoso-first} infrastructure resources and their representations in the tenant {product-title} cluster.
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To map nodes with {rhoso} compute instances, in the metric `kube_node_info`:
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* `node` is the Kubernetes node name.
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* `provider_id` contains the identifier of the corresponding compute service instance.
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To map persistent volumes with {rhoso} block storage or shared filesystems shares, in the metric `kube_persistentvolume_info`:
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* `persistentvolume` is the volume name.
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* `csi_volume_handle` is the block storage volume or share identifier.
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By default, the compute machines that back the cluster control plane nodes are created in a server group with a soft anti-affinity policy. As a result, the compute service creates them on separate hypervisors on a best-effort basis. However, if the state of the {rhoso} cluster is not appropriate for this distribution, the machines are created anyway.
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In combination with the default soft anti-affinity policy, you can configure an alert that activates when a hypervisor hosts more than one control plane node of a given cluster to highlight the degraded level of high availability.
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As an example, this PromQL query returns the number of {product-title} master nodes per {rh-openstack} host:
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[source,promql]
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----
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sum by (vm_instance) (
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group by (vm_instance, resource) (ceilometer_cpu)
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/ on (resource) group_right(vm_instance) (
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group by (node, resource) (
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label_replace(kube_node_info, "resource", "$1", "system_uuid", "(.+)")
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)
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/ on (node) group_left group by (node) (
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cluster:master_nodes
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)
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)
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)
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---- |