add cost query last update timestamp

fixes #152

Signed-off-by: Markus Blaschke <[email protected]>

Author: mblaschke

README.md

@@ -77,6 +77,7 @@ This exporter needs `Reader` permissions on subscription level.
 | `azurerm_costs_budget_limit`                | Costs      | Limit of CostManagemnet budget                                                               |
 | `azurerm_costs_budget_usage`                | Costs      | Percentage of usage of CostManagemnet budget                                                 |
 | `azurerm_costs_{queryName}`                 | Costs      | Costs query result (see `example.yaml`)                                                      |
+| `azurerm_costs_metric_timestamp_seconds`    | Costs      | Timestamp of last update per cost query                                                      |
 | `azurerm_subscription_info`                 | General    | Azure Subscription details (ID, name, ...)                                                   |
 | `azurerm_resource_health`                   | Health     | Azure Resource health information                                                            |
 | `azurerm_iam_roleassignment_info`           | IAM        | Azure IAM RoleAssignment information                                                         |
@@ -103,7 +104,7 @@ This exporter needs `Reader` permissions on subscription level.
 | `azurerm_publicip_info`                     | Portscan   | Azure PublicIP information                                                                   |
 | `azurerm_publicip_portscan_status`          | Portscan   | Status of scanned ports (finished scan, elapsed time, updated timestamp)                     |
 | `azurerm_publicip_portscan_port`            | Portscan   | List of opened ports per IP                                                                  |
-| `azurerm_advisor_recommendation`            | Advisor    | Azure Advisor recommendation    |
+| `azurerm_advisor_recommendation`            | Advisor    | Azure Advisor recommendation                                                                 |
 
 ### ResourceTags handling
 

metrics_azurerm_costs.go

@@ -30,6 +30,10 @@ const (
 type (
 	MetricsCollectorAzureRmCosts struct {
 		collector.Processor
+
+		prometheus struct {
+			lastUpdate *prometheus.GaugeVec
+		}
 	}
 
 	MetricsCollectorAzureRmCostsQuery struct {
@@ -56,6 +60,19 @@ type (
 func (m *MetricsCollectorAzureRmCosts) Setup(collector *collector.Collector) {
 	m.Processor.Setup(collector)
 
+	// ----------------------------------------------------
+	// Last update
+	m.prometheus.lastUpdate = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Name: "azurerm_costs_metric_timestamp_seconds",
+			Help: "Azure ResourceManager cost query last update timestamp budget info",
+		},
+		[]string{
+			"metric",
+		},
+	)
+	m.Collector.RegisterMetricList("lastUpdate", m.prometheus.lastUpdate, true)
+
 	// ----------------------------------------------------
 	// Costs (by Query)
 
@@ -159,13 +176,14 @@ func (m *MetricsCollectorAzureRmCosts) collectRunCostQuery(query *config.Collect
 					timeframe,
 					subscription,
 				)
-
 			})
 			if err != nil {
 				panic(err)
 			}
 		}
 	}
+
+	m.Collector.GetMetricList("lastUpdate").AddTime(prometheus.Labels{"metric": query.GetMetricName()}, time.Now())
 }
 
 func (m *MetricsCollectorAzureRmCosts) collectCostManagementMetrics(logger *slog.Logger, metricList *collector.MetricList, scope string, exportType armcostmanagement.ExportType, query *config.CollectorCostsQuery, timeframe string, subscription *armsubscriptions.Subscription) {