xds: Fix WRR test flake with TSAN #12523
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Fixes:
```
org.mockito.exceptions.verification.TooManyActualInvocations:
metricSink.addLongCounter(
<custom argument matcher>,
1L,
[directaddress:///wrr-metrics],
[, ]
);
Wanted 1 time:
-> at io.grpc.xds.WeightedRoundRobinLoadBalancerTest.metricWithRealChannel(WeightedRoundRobinLoadBalancerTest.java:1307)
But was 2 times:
-> at io.grpc.internal.MetricRecorderImpl.addLongCounter(MetricRecorderImpl.java:103)
-> at io.grpc.internal.MetricRecorderImpl.addLongCounter(MetricRecorderImpl.java:103)
at io.grpc.xds.WeightedRoundRobinLoadBalancerTest.metricWithRealChannel(WeightedRoundRobinLoadBalancerTest.java:1307)
```
sauravzg
approved these changes
Nov 19, 2025
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Fixes: