diff --git a/x-pack/metricbeat/module/azure/service_interface.go b/x-pack/metricbeat/module/azure/service_interface.go
index cb524c7f6ea..d2dd71c5005 100644
--- a/x-pack/metricbeat/module/azure/service_interface.go
+++ b/x-pack/metricbeat/module/azure/service_interface.go
@@ -15,5 +15,16 @@ type Service interface {
 	GetResourceDefinitions(id []string, group []string, rType string, query string) ([]*armresources.GenericResourceExpanded, error)
 	GetMetricDefinitionsWithRetry(resourceId string, namespace string) (armmonitor.MetricDefinitionCollection, error)
 	GetMetricNamespaces(resourceId string) (armmonitor.MetricNamespaceCollection, error)
-	GetMetricValues(resourceId string, namespace string, timegrain string, timespan string, metricNames []string, aggregations string, filter string) ([]armmonitor.Metric, string, error)
+	// GetMetricValues returns the metric values for the given resource ID, namespace, timegrain, timespan, metricNames, aggregations and filter.
+	//
+	// If the timegrain is empty, the default timegrain for the metric is used and returned.
+	GetMetricValues(
+		resourceId string,    // resourceId is the ID of the resource to query (e.g. "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/{resourceProviderNamespace}/{resourceType}/{resourceName}")
+		namespace string,     // namespace is the metric namespace to query (e.g. "Microsoft.Compute/virtualMachines")
+		timegrain string,     // timegrain is the timegrain to use for the metric query (e.g. "PT1M"); if empty, returns the default timegrain for the metric.
+		timespan string,      // timespan is the time interval to query (e.g. 2024-04-29T14:03:00Z/2024-04-29T14:04:00Z)
+		metricNames []string, // metricNames is the list of metric names to query (e.g. ["ServiceApiLatency", "Availability"])
+		aggregations string,  // aggregations is the comma-separated list of aggregations to use for the metric query (e.g. "Average,Maximum,Minimum")
+		filter string,        // filter is the filter to query for dimensions (e.g. "ActivityType eq '*' AND ActivityName eq '*' AND StatusCode eq '*' AND StatusCodeClass eq '*'")
+	) ([]armmonitor.Metric, string, error)
 }