Metricbeat – Statsd Module issue with count value when using timer/histogram metric type

[abraxas81]

Hi I would like to report issue with metricbeat Statsd module.

When flushing timer and histogram metric types, count value just keep growing instead of being reset, they are reset only when there is some inactivity between flushes.

The problem occurs with timer and histogram metric types for count value.

If you compare behaviour with GitHub - statsd/statsd: Daemon for easy but powerful stats aggregation they are resetting count value for timer metric type.

Configuration

• Version: Metricbeat: 8.13.4
• Docker image: docker.elastic.co/beats/metricbeat:8.13.4
• Discuss Forum URL: N/A
• Steps to Reproduce:

1. Enable statsd metricbeat module

   #statsd.yml 
   -   module: statsd
   metricsets: [ "server" ]
   host: "localhost"
   port: "8125"
   enabled: true
   period: 10s

2. Output to console

   #metricbeat.yml
   output.console:
   pretty: true

3. Send some example metrics while true; do echo "processing_item:3000|h" > /dev/udp/127.0.0.1/8125 ; sleep 3s; done
4. Example output

{
  "@timestamp": "2024-06-04T13:58:55.047Z",
  "@metadata": {
    "beat": "metricbeat",
    "type": "_doc",
    "version": "8.13.4"
  },
  "statsd": {
    "processing_item": {
      "median": 3000,
      "p75": 3000,
      "p95": 3000,
      "p99_9": 3000,
      "stddev": 0,
      "p99": 3000,
      "count": 4,
      "min": 3000,
      "max": 3000,
      "mean": 3000
    }
  },
}
{
  "@timestamp": "2024-06-04T13:59:05.047Z",
  "@metadata": {
    "beat": "metricbeat",
    "type": "_doc",
    "version": "8.13.4"
  },
  "statsd": {
    "processing_item": {
      "mean": 3000,
      "p95": 3000,
      "median": 3000,
      "p99": 3000,
      "count": 7, #expected 3
      "max": 3000,
      "p75": 3000,
      "p99_9": 3000,
      "min": 3000,
      "stddev": 0
    }
  },
}
{
  "@timestamp": "2024-06-04T13:59:15.046Z",
  "@metadata": {
    "beat": "metricbeat",
    "type": "_doc",
    "version": "8.13.4"
  },
  "statsd": {
    "processing_item": {
      "mean": 3000,
      "p75": 3000,
      "count": 10, #expected 3
      "stddev": 0,
      "p99_9": 3000,
      "median": 3000,
      "p95": 3000,
      "min": 3000,
      "max": 3000,
      "p99": 3000
    }
  }
}

5. We got count 4, 7, 10 instead expected count 4, 3, 3