Spring Boot微服务日志无法推送至Grafana Loki求助

我正在为Spring Boot微服务搭建基于Grafana Stack的可观测性体系，但目前无法在Grafana的Loki面板中查看服务日志。我怀疑问题出在docker-compose.yml、otel-collector.yml或OpenTelemetryConfig.java这几个配置文件中，以下是关键代码片段：

otel-collector.yml 关键配置 #

receivers:
  otlp:
    protocols:
      grpc:
        endpoint: 0.0.0.0:4317
      http:
        endpoint: 0.0.0.0:4318
  jaeger:
    protocols:
      grpc:
        endpoint: 0.0.0.0:14250
      thrift_http:
        endpoint: 0.0.0.0:14268
  prometheus:
    config:
      scrape_configs:
        - job_name: 'otel-collector'
          scrape_interval: 10s
          static_configs:
            - targets: ['0.0.0.0:8888']

processors:
  batch:

exporters:
  prometheus:
    endpoint: "prometheus:9090"
  logging:
    loglevel: debug
  otlp:
    endpoint: tempo:4317
    tls:
      insecure: true
  loki:
    endpoint: "loki:3100/loki/api/v1/push"
    tls:
      insecure: true

service:
  pipelines:
    traces:
      receivers: [otlp, jaeger]
      processors: [batch]
      exporters: [logging, otlp]
    metrics:
      receivers: [otlp, prometheus]
      processors: [batch]
      exporters: [logging, prometheus]
    logs:
      receivers: [otlp]
      processors: [batch]
      exporters: [logging, loki]

docker-compose.yml 关键配置 #

services:
  otel-collector:
    image: otel/opentelemetry-collector-contrib:0.86.0
    command: ["--config=/etc/otel-collector.yml"]
    volumes:
      - ./docker/collector/otel-collector.yml:/etc/otel-collector.yml
    ports:
      - "4317:4317" # OTLP gRPC receiver
      - "4318:4318" # OTLP HTTP receiver
      - "14250:14250" # Jaeger gRPC
      - "14268:14268" # Jaeger thrift HTTP
      - "8888:8888" # Prometheus metrics exposed by the collector
    depends_on:
      - prometheus
      - tempo
      - loki

  loki:
    image: grafana/loki:2.9.2
    ports:
      - "3100:3100"
    command: -config.file=/etc/loki/local-config.yaml
    volumes:
      - ./docker/loki/loki-config.yml:/etc/loki/local-config.yaml

  grafana:
    image: grafana/grafana:10.1.0
    ports:
      - "3000:3000"
    volumes:
      - ./docker/grafana/provisioning:/etc/grafana/provisioning
      - grafana_data:/var/lib/grafana
    environment:
      - GF_SECURITY_ADMIN_PASSWORD=admin
    depends_on:
      - prometheus
      - loki
      - tempo

OpenTelemetryConfig.java 完整代码 #

package com.tournament.config.common;

import io.opentelemetry.api.OpenTelemetry;
import io.opentelemetry.api.trace.Tracer;
import io.opentelemetry.exporter.otlp.logs.OtlpGrpcLogRecordExporter;
import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter;
import io.opentelemetry.sdk.OpenTelemetrySdk;
import io.opentelemetry.sdk.logs.LogRecordProcessor;
import io.opentelemetry.sdk.logs.SdkLoggerProvider;
import io.opentelemetry.sdk.logs.export.BatchLogRecordProcessor;
import io.opentelemetry.sdk.resources.Resource;
import io.opentelemetry.sdk.trace.SdkTracerProvider;
import io.opentelemetry.sdk.trace.export.BatchSpanProcessor;
import io.opentelemetry.semconv.resource.attributes.ResourceAttributes;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class OpenTelemetryConfig {

    @Bean
    public OpenTelemetry openTelemetry() {
        Resource resource = Resource.getDefault()
                .merge(Resource.create(ResourceAttributes.SERVICE_NAME.of("tourni-identity-service")));

        // Trace exporter
        OtlpGrpcSpanExporter spanExporter = OtlpGrpcSpanExporter.builder()
                .setEndpoint("http://localhost:4317")
                .build();

        // Log exporter
        OtlpGrpcLogRecordExporter logExporter = OtlpGrpcLogRecordExporter.builder()
                .setEndpoint("http://localhost:4317")
                .build();

        SdkTracerProvider tracerProvider = SdkTracerProvider.builder()
                .addSpanProcessor(BatchSpanProcessor.builder(spanExporter).build())
                .setResource(resource)
                .build();

        LogRecordProcessor logRecordProcessor = BatchLogRecordProcessor.builder(logExporter).build();
        SdkLoggerProvider loggerProvider = SdkLoggerProvider.builder()
                .addLogRecordProcessor(logRecordProcessor)
                .setResource(resource)
                .build();

        OpenTelemetrySdk openTelemetry = OpenTelemetrySdk.builder()
                .setTracerProvider(tracerProvider)
                .setLoggerProvider(loggerProvider)
                .build();

        Runtime.getRuntime().addShutdownHook(new Thread(() -> {
            tracerProvider.shutdown();
            loggerProvider.shutdown();
        }));

        return openTelemetry;
    }

    @Bean
    public Tracer tracer(OpenTelemetry openTelemetry) {
        return openTelemetry.getTracer("tourni-identity-service");
    }
}

我参考了Spring Boot整合OpenTelemetry+Prometheus+Grafana+Tempo的相关文章进行配置，但一直卡在日志无法导入Loki的问题上，恳请帮忙排查可能的配置错误。

内容的提问来源于stack exchange，提问作者Raju