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Merge pull request #7 from sapcc/manual-maintenance
Manual maintenance
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,162 @@ | ||
| // Copyright 2020 SAP SE | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package controller | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "reflect" | ||
| "strings" | ||
|
|
||
| monitoringv1 "github.com/coreos/prometheus-operator/pkg/apis/monitoring/v1" | ||
| "github.com/pkg/errors" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| ) | ||
|
|
||
| // getPromRulefromAbsentRuleGroup takes the name of a RuleGroup name that holds | ||
| // absent alerts and returns the name of the origin PrometheusRule that holds | ||
| // the corresponding alert definitions. An empty string is returned if the name | ||
| // can't be determined. | ||
| // | ||
| // Absent alert RuleGroups names have the format: | ||
| // originPrometheusRuleName/RuleGroupName | ||
| func getPromRulefromAbsentRuleGroup(group string) string { | ||
| sL := strings.Split(group, "/") | ||
| if len(sL) != 2 { | ||
| return "" | ||
| } | ||
| return sL[0] | ||
| } | ||
|
|
||
| // cleanUpOrphanedAbsentAlertsNamespace deletes orphaned absent alerts across a | ||
| // cluster. | ||
| func (c *Controller) cleanUpOrphanedAbsentAlertsCluster() error { | ||
| // Get names of all PrometheusRules that exist in the informer's cache: | ||
| // map of namespace to map[promRuleName]bool | ||
| promRules := make(map[string]map[string]bool) | ||
| objs := c.promRuleInformer.GetStore().List() | ||
| for _, v := range objs { | ||
| pr, ok := v.(*monitoringv1.PrometheusRule) | ||
| if !ok { | ||
| continue | ||
| } | ||
| ns := pr.GetNamespace() | ||
| if _, ok = promRules[ns]; !ok { | ||
| promRules[ns] = make(map[string]bool) | ||
| } | ||
| promRules[ns][pr.GetName()] = true | ||
| } | ||
|
|
||
| for namespace, promRuleNames := range promRules { | ||
| // Get all absentPrometheusRules for this namespace. | ||
| prList, err := c.promClientset.MonitoringV1().PrometheusRules(namespace). | ||
| List(context.Background(), metav1.ListOptions{LabelSelector: labelOperatorManagedBy}) | ||
| if err != nil { | ||
| return errors.Wrap(err, "could not list AbsentPrometheusRules") | ||
| } | ||
|
|
||
| for _, pr := range prList.Items { | ||
| // Check if there are any alerts in this absentPrometheusRule that | ||
| // don't belong to any PrometheusRule in promRuleNames. | ||
| // | ||
| // cleanup map is used because there could be multiple RuleGroups | ||
| // that contain absent alerts concerning a single PrometheusRule | ||
| // therefore we check all the groups before doing any cleanup. | ||
| cleanup := make(map[string]struct{}) | ||
| for _, g := range pr.Spec.Groups { | ||
| n := getPromRulefromAbsentRuleGroup(g.Name) | ||
| if n != "" && !promRuleNames[n] { | ||
| cleanup[n] = struct{}{} | ||
| } | ||
| } | ||
|
|
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| aPR := &absentPrometheusRule{PrometheusRule: pr} | ||
| for n := range cleanup { | ||
| if err := c.cleanUpOrphanedAbsentAlerts(n, aPR); err != nil { | ||
| return err | ||
| } | ||
| c.metrics.SuccessfulPrometheusRuleReconcileTime.DeleteLabelValues(namespace, n) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // cleanUpOrphanedAbsentAlertsNamespace deletes orphaned absent alerts | ||
| // concerning a specific PrometheusRule from a namespace. | ||
| // | ||
| // This is used when we don't know the prometheus server name of the | ||
| // PrometheusRule so we list all the AbsentPrometheusRules in a namespace and | ||
| // find the one that has the corresponding absent alerts. | ||
| func (c *Controller) cleanUpOrphanedAbsentAlertsNamespace(promRuleName, namespace string) error { | ||
| prList, err := c.promClientset.MonitoringV1().PrometheusRules(namespace). | ||
| List(context.Background(), metav1.ListOptions{LabelSelector: labelOperatorManagedBy}) | ||
| if err != nil { | ||
| return errors.Wrap(err, "could not list AbsentPrometheusRules") | ||
| } | ||
|
|
||
| for _, pr := range prList.Items { | ||
| for _, g := range pr.Spec.Groups { | ||
| n := getPromRulefromAbsentRuleGroup(g.Name) | ||
| if n != "" && n == promRuleName { | ||
| aPR := &absentPrometheusRule{PrometheusRule: pr} | ||
| err = c.cleanUpOrphanedAbsentAlerts(promRuleName, aPR) | ||
| break | ||
| } | ||
| } | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| // cleanUpOrphanedAbsentAlerts deletes orphaned absent alerts concerning a | ||
| // specific PrometheusRule from a specific absentPrometheusRule. | ||
| func (c *Controller) cleanUpOrphanedAbsentAlerts(promRuleName string, absentPromRule *absentPrometheusRule) error { | ||
| old := absentPromRule.Spec.Groups | ||
| new := make([]monitoringv1.RuleGroup, 0, len(old)) | ||
| for _, g := range old { | ||
| n := getPromRulefromAbsentRuleGroup(g.Name) | ||
| if n != "" && n == promRuleName { | ||
| continue | ||
| } | ||
| new = append(new, g) | ||
| } | ||
| if reflect.DeepEqual(old, new) { | ||
| return nil | ||
| } | ||
|
|
||
| var err error | ||
| absentPromRule.Spec.Groups = new | ||
| if len(absentPromRule.Spec.Groups) == 0 { | ||
| err = c.promClientset.MonitoringV1().PrometheusRules(absentPromRule.Namespace). | ||
| Delete(context.Background(), absentPromRule.Name, metav1.DeleteOptions{}) | ||
| if err == nil { | ||
| c.logger.Debug("msg", "successfully deleted orphaned AbsentPrometheusRule", | ||
| "key", fmt.Sprintf("%s/%s", absentPromRule.Namespace, absentPromRule.Name)) | ||
| } | ||
| } else { | ||
| _, err = c.promClientset.MonitoringV1().PrometheusRules(absentPromRule.Namespace). | ||
| Update(context.Background(), absentPromRule.PrometheusRule, metav1.UpdateOptions{}) | ||
| if err == nil { | ||
| c.logger.Debug("msg", "successfully cleaned up orphaned absent metric alert rules", | ||
| "key", fmt.Sprintf("%s/%s", absentPromRule.Namespace, absentPromRule.Name)) | ||
| } | ||
| } | ||
| if err != nil { | ||
| return errors.Wrap(err, "could not clean up orphaned absent metric alert rules") | ||
| } | ||
|
|
||
| return nil | ||
| } |
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