[Cluster Agent] Add info metric cluster_checks_configs_info (#11518)

pkg/clusteragent/clusterchecks/dispatcher_configs.go

@@ -50,7 +50,11 @@ func (d *dispatcher) addConfig(config integration.Config, targetNodeName string)
 	digest := config.Digest()
 	d.store.digestToConfig[digest] = config
 	for _, instance := range config.Instances {
-		d.store.idToDigest[check.BuildID(config.Name, instance, config.InitConfig)] = digest
+		checkID := check.BuildID(config.Name, instance, config.InitConfig)
+		d.store.idToDigest[checkID] = digest
+		if targetNodeName != "" {
+			configsInfo.Set(1.0, targetNodeName, string(checkID), le.JoinLeaderValue)
+		}
 	}
 
 	// No target node specified: store in danglingConfigs
@@ -91,6 +95,7 @@ func (d *dispatcher) removeConfig(digest string) {
 
 	for k, v := range d.store.idToDigest {
 		if v == digest {
+			configsInfo.Delete(node.name, string(k), le.JoinLeaderValue)
 			delete(d.store.idToDigest, k)
 		}
 	}

pkg/clusteragent/clusterchecks/dispatcher_nodes.go

@@ -126,6 +126,15 @@ func (d *dispatcher) expireNodes() {
 				log.Debugf("Adding %s:%s as a dangling Cluster Check config", config.Name, digest)
 				d.store.danglingConfigs[digest] = config
 				danglingConfigs.Inc(le.JoinLeaderValue)
+
+				// TODO: Use partial label matching when it becomes available:
+				// Replace the loop by a single function call (delete by node name).
+				// Requires https://github.com/prometheus/client_golang/pull/1013
+				for k, v := range d.store.idToDigest {
+					if v == digest {
+						configsInfo.Delete(name, string(k), le.JoinLeaderValue)
+					}
+				}
 			}
 			delete(d.store.nodes, name)
 

pkg/clusteragent/clusterchecks/metrics.go

@@ -41,4 +41,8 @@ var (
 	busyness = telemetry.NewGaugeWithOpts("cluster_checks", "busyness",
 		[]string{"node", le.JoinLeaderLabel}, "Busyness of a node per the number of metrics submitted and average duration of all checks run",
 		telemetry.Options{NoDoubleUnderscoreSep: true})
+	configsInfo = telemetry.NewGaugeWithOpts("cluster_checks", "configs_info",
+		[]string{"node", "check_id", le.JoinLeaderLabel}, "Information about the dispatched checks (node, check ID)",
+		telemetry.Options{NoDoubleUnderscoreSep: true},
+	)
 )

releasenotes/notes/clc-info-metric-26bcbaa314cb8e10.yaml

@@ -0,0 +1,5 @@
+---
+enhancements:
+  - |
+    The Cluster Agent now exposes a new metric ``cluster_checks_configs_info``.
+    It exposes the node and the check ID as tags.