MON-3181: Expose and propagate TopologySpreadConstraints for thanos-querier

Documentation/api.md

@@ -542,6 +542,7 @@ The `ThanosQuerierConfig` resource defines settings for the Thanos Querier compo
 | nodeSelector | map[string]string | Defines the nodes on which the pods are scheduled. |
 | resources | *[v1.ResourceRequirements](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.27/#resourcerequirements-v1-core) | Defines resource requests and limits for the Thanos Querier container. |
 | tolerations | [][v1.Toleration](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.27/#toleration-v1-core) | Defines tolerations for the pods. |
+| topologySpreadConstraints | []v1.TopologySpreadConstraint | Defines a pod's topology spread constraints. |
 
 [Back to TOC](#table-of-contents)
 

Documentation/openshiftdocs/modules/thanosquerierconfig.adoc

@@ -30,6 +30,8 @@ Appears in: link:clustermonitoringconfiguration.adoc[ClusterMonitoringConfigurat
 
 |tolerations|[]v1.Toleration|Defines tolerations for the pods.
 
+|topologySpreadConstraints|[]v1.TopologySpreadConstraint|Defines a pod's topology spread constraints.
+
 |===
 
 link:../index.adoc[Back to TOC]

pkg/manifests/manifests.go

@@ -2799,6 +2799,10 @@ func (f *Factory) ThanosQuerierDeployment(grpcTLS *v1.Secret, enableUserWorkload
 	if len(f.config.ClusterMonitoringConfiguration.ThanosQuerierConfig.Tolerations) > 0 {
 		d.Spec.Template.Spec.Tolerations = f.config.ClusterMonitoringConfiguration.ThanosQuerierConfig.Tolerations
 	}
+	if len(f.config.ClusterMonitoringConfiguration.ThanosQuerierConfig.TopologySpreadConstraints) > 0 {
+		d.Spec.Template.Spec.TopologySpreadConstraints =
+			f.config.ClusterMonitoringConfiguration.ThanosQuerierConfig.TopologySpreadConstraints
+	}
 
 	return d, nil
 }

pkg/manifests/manifests_test.go

@@ -3348,7 +3348,14 @@ func TestThanosQuerierConfiguration(t *testing.T) {
       memory: 4Mi
   logLevel: debug
   enableRequestLogging: true
-  enableCORS: true`, false)
+  enableCORS: true
+  topologySpreadConstraints:
+  - maxSkew: 1
+    topologyKey: type
+    whenUnsatisfiable: DoNotSchedule
+    labelSelector:
+      matchLabels:
+        foo: bar`, false)
 
 	if err != nil {
 		t.Fatal(err)
@@ -3391,6 +3398,28 @@ func TestThanosQuerierConfiguration(t *testing.T) {
 		})
 	}
 
+	for _, tc := range []struct {
+		name      string
+		want, got interface{}
+	}{
+		{
+			name: "Topology",
+			want: []v1.TopologySpreadConstraint{
+				{
+					MaxSkew:           1,
+					WhenUnsatisfiable: "DoNotSchedule",
+				},
+			},
+			got: d.Spec.Template.Spec.TopologySpreadConstraints[0],
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			if reflect.DeepEqual(tc.got, tc.want) {
+				t.Errorf("thanos-querier topology spread contraints WhenUnsatisfiable not configured correctly: want %+v, got %+v", tc.want, tc.got)
+			}
+		})
+	}
+
 	kubeRbacProxyTLSCipherSuitesArg := ""
 	kubeRbacProxyMinTLSVersionArg := ""
 	for _, c := range d.Spec.Template.Spec.Containers {

pkg/manifests/types.go

@@ -270,6 +270,8 @@ type ThanosQuerierConfig struct {
 	Resources *v1.ResourceRequirements `json:"resources,omitempty"`
 	// Defines tolerations for the pods.
 	Tolerations []v1.Toleration `json:"tolerations,omitempty"`
+	// Defines a pod's topology spread constraints.
+	TopologySpreadConstraints []v1.TopologySpreadConstraint `json:"topologySpreadConstraints,omitempty"`
 }
 
 // The `NodeExporterConfig` resource defines settings for the `node-exporter` agent.