Error with Connector Count: Invalid Temporality and Type Combination for Metric in Prometheus Remote Write

[sswieton]

Hi,

Context :
open-telemetry/opentelemetry-collector 0.115.1

Description

I'd like to count the number of logs generated by my application and create a new metric in OpenTelemetry Collector that reflects this count
I am using a count connector, and the metric is pushed to a Prometheus instance using the Prometheus Remote Write exporter

An error is generated by the Prometheus Remote Write exporter stating: "invalid temporality and type combination for metric 'my.count'".
The metric generated seems to have Aggregation Temporality set to Delta, but I dont' know how to change it to Cumulative in the count connector configuration.

It may not be the reason for the issue. Could you please help?
Thanks for your support

  connectors:
    count:
      logs:
        my.count:
          description: "count logs"
          attributes:
            - key: service.name
              default_value: "otel-test-app"      

Pipeline

    pipelines:
      ...
      metrics/counts:
        receivers: [count]
        processors: [batch]
        exporters: 
         - prometheusremotewrite
   
      logs:
        receivers:
          - otlp
        processors:
          - attributes/logs
          - k8sattributes/logs
          - batch
        exporters: 
          - otlphttp/loki
          - count

Detailled Logs

InstrumentationScope github.com/open-telemetry/opentelemetry-collector-contrib/connector/countconnector
Metric #0
Descriptor:
-> Name: my.count
-> Description: count logs
-> Unit:
-> DataType: Sum
-> IsMonotonic: true
-> AggregationTemporality: Delta
NumberDataPoints #0
Data point attributes:
-> service.name: Str(otel-test-app)
StartTimestamp: 1970-01-01 00:00:00 +0000 UTC
Timestamp: 2025-01-10 14:06:07.278717542 +0000 UTC
Value: 1

2025-01-10T14:06:08.279Z debug [email protected]/exporter.go:198 failed to translate metrics, exporting remaining metrics {"kind": "exporter", "data_type": "metrics", "name": "prometheusremotewrite", "error": "invalid temporality and type combination for metric "my.count"", "translated": 1}

[sswieton]

We need to use the deltatocumulative processor to convert delta temporality metrics to cumulative. This would be added in your metrics pipeline