#20233
89%

Ran 02 Apr 2026 12:30PM UTC

Jobs 1

Files 647

Run time 1min

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Committed 02 Apr 2026 12:18PM UTC coverage: 88.792% (+0.008%) from 88.784%

Build # #20233

Build Type

push

github

Committed by

web-flow

Commit Message

[xds] Implement A114: WRR support for custom backend metrics (#12645)

### Description
This PR implements [gRFC A114: WRR Support for Custom Backend
Metrics](https://github.com/grpc/proposal/pull/536).

It updates the `weighted_round_robin` policy to allow users to configure
which backend metrics drive the load balancing weights.

### Key Changes
* **Configuration**: Supports the new
`metric_names_for_computing_utilization` field in
`WeightedRoundRobinLbConfig`.
* **Weight Calculation**: Implements logic to resolve custom metrics
(including map lookups like `named_metrics.foo`) when
`application_utilization` is absent.
* **Refactor**: Centralizes the complex metric lookup and validation
logic (checking for NaN, <= 0, etc.) into a new internal utility
`MetricReportUtils`.
* **Testing**: Verifies correct precedence: `application_utilization` >
`custom_metrics` (max valid value) > `cpu_utilization`.

Coverage Stats

36007 of 40552 relevant lines covered (88.79%)

0.89 hits per line

Coverage Regressions

Lines	Coverage	∆	File
10	91.24	0.26%	../xds/src/main/java/io/grpc/xds/LoadBalancerConfigFactory.java
5	98.55	0.07%	../xds/src/main/java/io/grpc/xds/WeightedRoundRobinLoadBalancer.java
2	87.75	-0.4%	../core/src/main/java/io/grpc/internal/DelayedClientCall.java
2	75.0	-1.72%	../servlet/src/main/java/io/grpc/servlet/ServletServerStream.java
2	89.19	1.31%	../xds/src/main/java/io/grpc/xds/WeightedRoundRobinLoadBalancerProvider.java
1	93.83	-0.62%	../opentelemetry/src/main/java/io/grpc/opentelemetry/OpenTelemetryMetricSink.java

Jobs

ID	Job ID	Ran	Files	Coverage
1	#20233.1	02 Apr 2026 12:30PM UTC	647	88.79

grpc / grpc-java / #20233
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