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publish gauges with akka cluster members per status (#1189)
* publish gauges with cluster members per status * only apply cluster instrumentation on Akka 2.5/2.6 * remove the bintray plugin * publish status and reachability gauges for Cluster members * use backwards-compatible version of Cluster.subscribe(...) * avoid registering member metrics without tags * put the cluster metrics behind an feature flag
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174
...src/common/scala/kamon/instrumentation/akka/instrumentations/ClusterInstrumentation.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| package kamon.instrumentation | ||
| package akka.instrumentations | ||
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| import _root_.akka.actor.{Actor, Address, ExtendedActorSystem, Props} | ||
| import _root_.akka.cluster.{Cluster, ClusterEvent, MemberStatus} | ||
| import kamon.Kamon | ||
| import kamon.instrumentation.akka.AkkaInstrumentation | ||
| import kamon.metric.Gauge | ||
| import kamon.tag.TagSet | ||
| import kanela.agent.api.instrumentation.InstrumentationBuilder | ||
| import kanela.agent.libs.net.bytebuddy.asm.Advice | ||
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| import scala.collection.mutable | ||
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| class ClusterInstrumentation extends InstrumentationBuilder with VersionFiltering { | ||
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| onAkka("2.5", "2.6") { | ||
| onType("akka.cluster.Cluster$") | ||
| .advise(method("createExtension").and(takesArguments(1)), AfterClusterInitializationAdvice) | ||
| } | ||
| } | ||
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| object AfterClusterInitializationAdvice { | ||
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| @Advice.OnMethodExit | ||
| def onClusterExtensionCreated(@Advice.Argument(0) system: ExtendedActorSystem, @Advice.Return clusterExtension: Cluster): Unit = { | ||
| val settings = AkkaInstrumentation.settings() | ||
| if(settings.exposeClusterMetrics) { | ||
| val stateExporter = system.systemActorOf(Props[ClusterInstrumentation.ClusterStateExporter], "kamon-cluster-state-exporter") | ||
| clusterExtension.subscribe(stateExporter, classOf[ClusterEvent.ClusterDomainEvent]) | ||
| } | ||
| } | ||
| } | ||
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| object ClusterInstrumentation { | ||
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| class ClusterStateExporter extends Actor { | ||
| private val clusterExtension = Cluster(context.system) | ||
| private val clusterTags = TagSet.of("akka.system.name", context.system.name) | ||
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| private val joiningMembers = ClusterMembersJoining.withTags(clusterTags) | ||
| private val weaklyUpMembers = ClusterMembersWeaklyUp.withTags(clusterTags) | ||
| private val upMembers = ClusterMembersUp.withTags(clusterTags) | ||
| private val leavingMembers = ClusterMembersLeaving.withTags(clusterTags) | ||
| private val exitingMembers = ClusterMembersExiting.withTags(clusterTags) | ||
| private val downMembers = ClusterMembersDown.withTags(clusterTags) | ||
| private val removedMembers = ClusterMembersRemoved.withTags(clusterTags) | ||
| private val totalMembers = ClusterMembersTotal.withTags(clusterTags) | ||
| private val unreachableMembers = ClusterMembersUnreachable.withTags(clusterTags) | ||
| private val unreachableDatacenters = ClusterDatacentersUnreachable.withTags(clusterTags) | ||
| private val monitoredNodes = mutable.HashMap.empty[Address, (Gauge, Gauge)] | ||
|
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| override def receive: Receive = { | ||
| case _: ClusterEvent.ClusterDomainEvent => updateAllStates(clusterExtension.state) | ||
| case initialState: ClusterEvent.CurrentClusterState => updateAllStates(initialState) | ||
| } | ||
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| private def updateAllStates(clusterState: ClusterEvent.CurrentClusterState): Unit = { | ||
| val membersPerStatus = clusterState.members.groupBy(_.status) | ||
| joiningMembers.update(membersPerStatus.getOrElse(MemberStatus.Joining, Set.empty).size) | ||
| weaklyUpMembers.update(membersPerStatus.getOrElse(MemberStatus.WeaklyUp, Set.empty).size) | ||
| upMembers.update(membersPerStatus.getOrElse(MemberStatus.Up, Set.empty).size) | ||
| leavingMembers.update(membersPerStatus.getOrElse(MemberStatus.Leaving, Set.empty).size) | ||
| exitingMembers.update(membersPerStatus.getOrElse(MemberStatus.Exiting, Set.empty).size) | ||
| downMembers.update(membersPerStatus.getOrElse(MemberStatus.Down, Set.empty).size) | ||
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| val removedMembersCount = membersPerStatus.getOrElse(MemberStatus.Removed, Set.empty).size | ||
| val totalMembersCount = clusterState.members.size - removedMembersCount | ||
| removedMembers.update(removedMembersCount) | ||
| totalMembers.update(totalMembersCount) | ||
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| unreachableMembers.update(clusterState.unreachable.size) | ||
| unreachableDatacenters.update(clusterState.unreachableDataCenters.size) | ||
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| // The status and reachability gauges will only be published for the subset of members that are currently being | ||
| // monitored by this node. | ||
| val currentlyMonitoredMembers = clusterState.members.filter(m => clusterExtension.failureDetector.isMonitoring(m.address)) | ||
| val currentlyMonitoredAddresses = currentlyMonitoredMembers.map { member => | ||
| val (statusGauge, reachabilityGauge) = monitoredNodes.getOrElseUpdate(member.address, { | ||
| val memberTags = clusterTags.withTag("member", member.address.toString) | ||
|
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| ( | ||
| ClusterMemberStatus.withTags(memberTags), | ||
| ClusterMemberReachability.withTags(memberTags) | ||
| ) | ||
| }) | ||
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| statusGauge.update(statusToGaugeValue(member.status)) | ||
| reachabilityGauge.update(if(clusterState.unreachable(member)) 1D else 0D) | ||
| member.address | ||
| } | ||
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| // Remove any cached Gauges for members that we might not be monitoring anymore | ||
| monitoredNodes.keys.filterNot(a => currentlyMonitoredAddresses(a)).foreach { addressToRemove => | ||
| monitoredNodes.remove(addressToRemove).foreach { | ||
| case (statusGauge, reachabilityGauge) => | ||
| statusGauge.remove() | ||
| reachabilityGauge.remove() | ||
| } | ||
| } | ||
| } | ||
|
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| private def statusToGaugeValue(memberStatus: MemberStatus): Double = memberStatus match { | ||
| case MemberStatus.Joining => 1 | ||
| case MemberStatus.WeaklyUp => 2 | ||
| case MemberStatus.Up => 3 | ||
| case MemberStatus.Leaving => 4 | ||
| case MemberStatus.Exiting => 5 | ||
| case MemberStatus.Down => 6 | ||
| case MemberStatus.Removed => 7 | ||
| case _ => 0 // This should never happen, but covering the bases here | ||
| } | ||
| } | ||
|
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| val ClusterMembersJoining = Kamon.gauge( | ||
| name = "akka.cluster.members.joining.count", | ||
| description = "Tracks the number of cluster members in the Joining state" | ||
| ) | ||
|
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| val ClusterMembersWeaklyUp = Kamon.gauge( | ||
| name = "akka.cluster.members.weakly-up.count", | ||
| description = "Tracks the number of cluster members in the Weakly-Up state" | ||
| ) | ||
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| val ClusterMembersUp = Kamon.gauge( | ||
| name = "akka.cluster.members.up.count", | ||
| description = "Tracks the number of cluster members in the Up state" | ||
| ) | ||
|
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| val ClusterMembersLeaving = Kamon.gauge( | ||
| name = "akka.cluster.members.leaving.count", | ||
| description = "Tracks the number of cluster members in the Leaving state" | ||
| ) | ||
|
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| val ClusterMembersExiting = Kamon.gauge( | ||
| name = "akka.cluster.members.exiting.count", | ||
| description = "Tracks the number of cluster members in the Exiting state" | ||
| ) | ||
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| val ClusterMembersDown = Kamon.gauge( | ||
| name = "akka.cluster.members.down.count", | ||
| description = "Tracks the number of cluster members in the Down state" | ||
| ) | ||
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| val ClusterMembersRemoved = Kamon.gauge( | ||
| name = "akka.cluster.members.removed.count", | ||
| description = "Tracks the number of cluster members in the Removed state" | ||
| ) | ||
|
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| val ClusterMembersTotal = Kamon.gauge( | ||
| name = "akka.cluster.members.total.count", | ||
| description = "Tracks the total number of cluster members, without including Removed members" | ||
| ) | ||
|
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| val ClusterMembersUnreachable = Kamon.gauge( | ||
| name = "akka.cluster.members.unreachable.count", | ||
| description = "Tracks the total number of cluster members marked as unreachable" | ||
| ) | ||
|
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| val ClusterDatacentersUnreachable = Kamon.gauge( | ||
| name = "akka.cluster.datacenters.unreachable.count", | ||
| description = "Tracks the total number of cluster members marked as unreachable" | ||
| ) | ||
|
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| val ClusterMemberStatus = Kamon.gauge( | ||
| name = "akka.cluster.members.status", | ||
| description = "Tracks the current status of all monitored nodes by a cluster member" | ||
| ) | ||
|
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| val ClusterMemberReachability = Kamon.gauge( | ||
| name = "akka.cluster.members.reachability", | ||
| description = "Tracks the current reachability status of all monitored nodes by a cluster member" | ||
| ) | ||
| } |
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