Alerting: Extra dedup stage in Grafana Alertmanager (#99825)

* add feature flags

* update alerting module

* update grafana alertmanager to configure the extra dedup stage

---------

Co-authored-by: Santiago <santiagohernandez.1997@gmail.com>

pkg/services/featuremgmt/registry.go

@@ -1772,6 +1772,24 @@ var (
 			HideFromAdminPage: true,
 			HideFromDocs:      true,
 		},
+		{
+			Name:              "alertingAlertmanagerExtraDedupStage",
+			Description:       "enables extra deduplication stage in alertmanager that checks that timestamps of the pipeline and the current state are matching",
+			Stage:             FeatureStageExperimental,
+			Owner:             grafanaAlertingSquad,
+			HideFromAdminPage: true,
+			HideFromDocs:      true,
+			RequiresRestart:   true,
+		},
+		{
+			Name:              "alertingAlertmanagerExtraDedupStageStopPipeline",
+			Description:       "works together with alertingAlertmanagerExtraDedupStage, if enabled, it will stop the pipeline if the timestamps are not matching. Otherwise, it will emit a warning",
+			Stage:             FeatureStageExperimental,
+			Owner:             grafanaAlertingSquad,
+			HideFromAdminPage: true,
+			HideFromDocs:      true,
+			RequiresRestart:   true,
+		},
 	}
 )
 

pkg/services/featuremgmt/toggles_gen.csv

@@ -236,3 +236,5 @@ grafanaAdvisor,experimental,@grafana/plugins-platform-backend,false,false,false
 elasticsearchImprovedParsing,experimental,@grafana/aws-datasources,false,false,false
 datasourceConnectionsTab,experimental,@grafana/plugins-platform-backend,false,false,true
 fetchRulesUsingPost,experimental,@grafana/alerting-squad,false,false,false
+alertingAlertmanagerExtraDedupStage,experimental,@grafana/alerting-squad,false,true,false
+alertingAlertmanagerExtraDedupStageStopPipeline,experimental,@grafana/alerting-squad,false,true,false

pkg/services/featuremgmt/toggles_gen.go

@@ -954,4 +954,12 @@ const (
 	// FlagFetchRulesUsingPost
 	// Use a POST request to list rules by passing down the namespaces user has access to
 	FlagFetchRulesUsingPost = "fetchRulesUsingPost"
+
+	// FlagAlertingAlertmanagerExtraDedupStage
+	// enables extra deduplication stage in alertmanager that checks that timestamps of the pipeline and the current state are matching
+	FlagAlertingAlertmanagerExtraDedupStage = "alertingAlertmanagerExtraDedupStage"
+
+	// FlagAlertingAlertmanagerExtraDedupStageStopPipeline
+	// works together with alertingAlertmanagerExtraDedupStage, if enabled, it will stop the pipeline if the timestamps are not matching. Otherwise, it will emit a warning
+	FlagAlertingAlertmanagerExtraDedupStageStopPipeline = "alertingAlertmanagerExtraDedupStageStopPipeline"
 )

pkg/services/featuremgmt/toggles_gen.json

@@ -143,6 +143,36 @@
         "codeowner": "@grafana/alerting-squad"
       }
     },
+    {
+      "metadata": {
+        "name": "alertingAlertmanagerExtraDedupStage",
+        "resourceVersion": "1738251165994",
+        "creationTimestamp": "2025-01-30T15:32:45Z"
+      },
+      "spec": {
+        "description": "enables extra deduplication stage in alertmanager that checks that timestamps of the pipeline and the current state are matching",
+        "stage": "experimental",
+        "codeowner": "@grafana/alerting-squad",
+        "requiresRestart": true,
+        "hideFromAdminPage": true,
+        "hideFromDocs": true
+      }
+    },
+    {
+      "metadata": {
+        "name": "alertingAlertmanagerExtraDedupStageStopPipeline",
+        "resourceVersion": "1738251165994",
+        "creationTimestamp": "2025-01-30T15:32:45Z"
+      },
+      "spec": {
+        "description": "works together with alertingAlertmanagerExtraDedupStage, if enabled, it will stop the pipeline if the timestamps are not matching. Otherwise, it will emit a warning",
+        "stage": "experimental",
+        "codeowner": "@grafana/alerting-squad",
+        "requiresRestart": true,
+        "hideFromAdminPage": true,
+        "hideFromDocs": true
+      }
+    },
     {
       "metadata": {
         "name": "alertingApiServer",