15:03:07,739 WARNING [io.opentelemetry.exporter.jaeger.JaegerGrpcSpanExporter] (grpc-default-executor-1) Failed to export spans: io.grpc.StatusRuntimeException: UNAVAILABLE
    at io.grpc.Status.asRuntimeException(Status.java:535)
    at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose(ClientCalls.java:533)
    at io.grpc.internal.DelayedClientCall$DelayedListener$3.run(DelayedClientCall.java:464)
    at io.grpc.internal.DelayedClientCall$DelayedListener.delayOrExecute(DelayedClientCall.java:428)
    at io.grpc.internal.DelayedClientCall$DelayedListener.onClose(DelayedClientCall.java:461)
    at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:553)
    at io.grpc.internal.ClientCallImpl.access$300(ClientCallImpl.java:68)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:739)
    at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:718)
    at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
    at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:476)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:218)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:200)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)
    at java.net.Socket.connect(Socket.java:606)
    at java.net.Socket.connect(Socket.java:555)
    at java.net.Socket.<init>(Socket.java:451)
    at java.net.Socket.<init>(Socket.java:261)
    at javax.net.DefaultSocketFactory.createSocket(SocketFactory.java:277)
    at io.grpc.okhttp.OkHttpClientTransport$4.run(OkHttpClientTransport.java:556)
    ... 4 more