Introduce DefaultXdsLoadBalancerLifecycleObserver
#6490
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Contributor
ikhoon
approved these changes
Nov 13, 2025
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| final ImmutableList.Builder<Meter> metersBuilder = ImmutableList.builder(); | ||
| metersBuilder.add(Gauge.builder(prefix.name("lb.state.subsets"), () -> numSubsets) |
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nit: Collection seems unnecessary.
| localClusterName = bootstrap.getClusterManager().getLocalClusterName(); | ||
| if (!Strings.isNullOrEmpty(localClusterName) && bootstrap.getNode().hasLocality()) { | ||
| final DefaultXdsLoadBalancerLifecycleObserver observer = | ||
| new DefaultXdsLoadBalancerLifecycleObserver(meterIdPrefix, meterRegistry, localClusterName); |
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I understand that there’s still no extension point for users to configure a custom XdsLoadBalancerLifecycleObserver.
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Motivation:
When using xDS based clients, users will often want to know how the xDS resources translate to the load balancer which routes requests upstream.
This changeset attempts introduce a
DefaultXdsLoadBalancerLifecycleObserverwhich collects metrics of each load balancer for each cluster.This observer has the same lifecycle as a
ClusterResourceNode, and will deregister each metric upon close.Note that thanks to
XdsClusterManager, each cluster has a unique name.Modifications:
DefaultXdsLoadBalancerLifecycleObserveris introduced which records metrics for aXdsLoadBalancerMeterRegistry,MeterIdPrefixcan now be specified inXdsBootstrapBuilderMeterRegistry,MeterIdPrefixis also added toSubscriptionContextso that they can be accessed when dynamically querying xDS resourcesEventExecutoris used for the default event loop.Result:
DefaultXdsLoadBalancerLifecycleObservernow records metrics forXdsLoadBalancers by default