.net - OpenTelemetry 收集器导出到 Prometheus 不起作用

Question

所有，我正在尝试将 OpenTelemetry 收集器与 Prometheus 集成到 .Net 应用程序中。我在应用程序中使用 OTLP Exporter，并在同一系统上将 OpenTelemetry Collector 作为 Windows 服务运行。请找到以下我用于收集器的“config.yaml”

extensions:
  health_check:
  pprof:
    endpoint: 0.0.0.0:1777
  zpages:
    endpoint: 0.0.0.0:55679

receivers:
  otlp:
    protocols:
      grpc:
      http:
  prometheus:
    config:
      scrape_configs:
        - job_name: 'otel-collector'
          scrape_interval: 5s
          static_configs:
            - targets: [ 'localhost:55681' ]

processors:
  batch:

exporters:
  zipkin:
    endpoint: "http://127.0.0.1:9411/api/v2/spans"
  prometheus:
    endpoint: "localhost:55681"
    namespace: promexample
    const_labels:
      label1: value1
  logging:
    logLevel: debug

service:

  pipelines:

    traces:
      receivers: [otlp]
      processors: [batch]
      exporters: [logging,zipkin]

    metrics:
      receivers: [otlp,prometheus]
      processors: [batch]
      exporters: [logging,prometheus]

  extensions: [health_check, pprof, zpages]

这是'prometheus.yml'

# my global config
global:
  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

# Alertmanager configuration
alerting:
  alertmanagers:
  - static_configs:
    - targets:
      # - alertmanager:9093

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
  # - "first_rules.yml"
  # - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
    
  - job_name: 'otel-collector'
    scrape_interval: 10s
    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.
    static_configs:
      - targets: ['localhost:55681']

我没有看到导出到 Prometheus 的指标。我正在应用程序中以编程方式创建一些计数器，并在 Prometheus 中寻找相同的计数器。

请注意，我尝试将跟踪导出到 Zipkin 并且效果很好。

任何帮助是极大的赞赏。Prometheus UI 目标运行状况显示为“UP”，如下所示。