Problems with opentelemetry as INPUT and cloudwatch as OUTPUT

[Mistra]

Bug Report

Describe the bug
Different outcome from different [OUTPUT] plugins (cloudwatch and stdout) with input opentelemetry

To Reproduce

• Steps to reproduce the problem:

This is my configuration of fluentbit (latest version)

    [SERVICE]
        Flush        1
        Daemon       Off
        Log_Level debug

    [INPUT]
        Name         opentelemetry
        Listen       0.0.0.0
        Port         4318

    [OUTPUT]
        Name         stdout
        Match        *

    [OUTPUT]
        Name                        cloudwatch_logs
        Match                       *
        region                      eu-west-1
        log_group_name              /aws/containerinsights/test-OTL
        log_stream_prefix           from-fluent-bit-OTL-
        log_retention_days          10
        auto_create_group           true
        role_arn                    xxx
        log_format                  json/emf

I'm feeding to the endpoint "/v1/logs" the following JSON payload

{
	"resourceLogs": [
		{
			"resource": {
				"attributes": [
					{
						"key": "service.name",
						"value": {
							"string_value": "test-service"
						}
					},
					{
						"key": "host.name",
						"value": {
							"string_value": "test-host"
						}
					}
				]
			},
			"scopeLogs": [
				{
					"scope": {
						"name": "test-logger"
					},
					"logRecords": [
						{
							"severityText": "INFO",
							"body": {
								"stringValue": "Test log message from Fluent Bit setup"
							},
							"traceId": "123",
							"spanId": "456",
							"attributes": [
								{
									"key": "environment",
									"value": {
										"string_value": "development"
									}
								},
								{
									"key": "trace.id",
									"value": {
										"string_value": "1a2b3c4d5e6f7890"
									}
								},
								{
									"key": "span.id",
									"value": {
										"string_value": "abc123def456"
									}
								}
							]
						}
					]
				}
			]
		}
	]
}

Expected behavior
In stdout I get this:
[0] v1_logs: [[1733218249.306643377, {"environment"=>"development", "trace.id"=>"1a2b3c4d5e6f7890", "span.id"=>"abc123def456"}], {"log"=>"Test log message from Fluent Bit setup"}]
While in cloudwatch, under the stream "from-fluent-bit-OTL-v1_logs" just this:

{
    "log": "Test log message from Fluent Bit setup"
}

My question is: is it normal not getting the other keys? Is there a way to have on the stream also the attributes keys?

Your Environment

• Version used: 3.2.2
• Configuration: Fluentbit is running as a simple test deployment on my k8s cluster
• Environment name and version: I'm using AWS EKS 1.29