opentelemetry 连接被拒绝：localhost/0:0:0:0:0:0:0:1:4317

问题描述

我正在使用 opentelemtry 进行跟踪，以下是命令但出现错误 任何人都可以建议我在这里做错了什么：

java -Dotel.traces.exporter=jaeger  -Dotel.exporter.jaeger.endpoint=host:14250 -Dotel.resource.attributes=service.name=app-name \
  -javaagent:./opentelemetry-javaagent-all.jar -jar app-1.0.0.jar

[opentelemetry.auto.trace 2021-03-17 12:41:19:593 +0530] [IntervalMetricReader-1] WARN io.opentelemetry.exporter.otlp.metrics.OtlpGrpcmetricExporter - Failed to export metrics
io.grpc.StatusRuntimeException: UNAVAILABLE: io exception
        at io.grpc.Status.asRuntimeException(Status.java:534)
        at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:533)
        at io.grpc.internal.ClientCallImpl.cloSEObserver(ClientCallImpl.java:617)
        at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:70)
        at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:803)
        at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:782)
        at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
        at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: localhost/0:0:0:0:0:0:0:1:4317
Caused by: java.net.ConnectException: Connection refused
        at java.base/sun.nio.ch.socketChannelImpl.checkConnect(Native Method)
        at java.base/sun.nio.ch.socketChannelImpl.finishConnect(SocketChannelImpl.java:779)
        at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330)
        at io.netty.channel.nio.AbstractNioChannel$AbstractNIoUnsafe.finishConnect(AbstractNioChannel.java:334)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:702)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:834)

解决方法

据我所知，OTel 有 2 个模块 - 跟踪和度量。该错误似乎抱怨“指标”的导出，而您的跟踪实际上可能工作正常。它尝试使用默认指标导出器（非 jaeger）将指标写入本地 Otel 收集器 https://github.com/open-telemetry/opentelemetry-collector (localhost/0:0:0:0:0:0:0:1:4317)

在撰写本文时，指标仍被标记为 Alpha，如 https://github.com/open-telemetry/opentelemetry-java/blob/v1.0.1/QUICKSTART.mds

我没有使用过 jaeger，也许他们也支持指标。尝试-Dotel.metrics.exporter=jaeger，看看它是否有效。

如果您只想删除该警告，您可以考虑添加标志 -Dotel.metrics.exporter=none，该标志应禁用指标导出，而跟踪仍应起作用。