prometheus metric is malformed

[jasonschroeder-sfdc]

steps to reproduce:

1. bazelisk run //src/main/java/build/buildfarm:buildfarm-server -- --jvm_flag=-Djava.util.logging.config.file=$PWD/examples/logging.properties $PWD/examples/config.minimal.yml
2. curl localhost:9090 | grep queue_size

Expected:

queue_size{queue_name="cpu",} 0.0

Actual:

queue_size{queue_name="{}cpu",} 0.0

Something seems broken with

bazel-buildfarm/src/main/java/build/buildfarm/instance/shard/ServerInstance.java

Lines 541 to 547 in e1ad3ad

	private void updateQueueSizes(List<QueueStatus> queues) {
	if (queueSize != null) {
	for (QueueStatus queueStatus : queues) {
	queueSize.labels(queueStatus.getName()).set(queueStatus.getSize());
	}
	}
	}

[jasonschroeder-sfdc]

The name is mangled here:

bazel-buildfarm/src/main/java/build/buildfarm/common/redis/BalancedRedisQueue.java

Lines 377 to 382 in e1ad3ad

	// build proto
	return QueueStatus.newBuilder()
	.setName(RedisHashtags.hashedName(name, originalHashtag))
	.setSize(size)
	.addAllInternalSizes(sizes.build())
	.build();

379         setName(RedisHashTags.hashedName("cpu", ""))

returns:

{}cpu