{ ... }:
let
  otel-prometheus-exporter-port = 4316;
in
{
  services.opentelemetry-collector = {
    enable = true;
    settings = {
      receivers = {
        otlp = {
          protocols = {
            grpc.endpoint = "localhost:4317";
            http.endpoint = "localhost:4318";
          };
        };
        hostmetrics.scrapers = {
          cpu = { };
          disk = { };
          filesystem = { };
          load = { };
          memory = { };
          network = { };
          process = { };
          processes = { };
          paging = { };
        };
      };
      processors = {
        memory_limiter = {
          check_interval = "5s";
          limit_mib = 2500;
          spike_limit_mib = 500;
        };
        batch = {
          timeout = "10s";
          send_batch_size = 100;
        };
      };
      exporters = {
        debug = {
          verbosity = "detailed";
        };
        prometheus = {
          endpoint = "localhost:${toString otel-prometheus-exporter-port}";
          send_timestamps = true;
          enable_open_metrics = true;
        };
      };
      service = {
        extensions = [ ];
        pipelines = {
          traces = {
            receivers = [ "otlp" ];
            exporters = [ "debug" ];
          };
          metrics = {
            receivers = [
              "otlp"
              "hostmetrics"
            ];
            exporters = [
              "debug"
              "prometheus"
            ];
          };
          logs = {
            receivers = [ "otlp" ];
            exporters = [ "debug" ];
          };
        };
      };
    };
  };

  services.prometheus = {
    enable = true;
    globalConfig = {
      scrape_timeout = "10s";
      scrape_interval = "1m";
    };
    scrapeConfigs = [
      {
        job_name = "otel";
        scrape_interval = "5s";
        static_configs = [
          {
            targets = [ "localhost:${toString otel-prometheus-exporter-port}" ];
          }
        ];
      }
    ];
  };
}