Unable to add custom attributes under service

[fabry00]

Describe the bug
I'd like to add several attributes under service.* but so far all the attributes that I've added in the processors.resource.atrtibutes are added as children of labels.*

Steps to reproduce

Given the following configuration:

receivers:
  otlp:
    protocols:
      grpc:
        endpoint: 0.0.0.0:4317
      http:
        endpoint: 0.0.0.0:4318

processors:
  memory_limiter:
    check_interval: 1s
    limit_mib: 2000
  resource:
    attributes:
    - key: deployment.environment
      action: insert
      value: dev
    - key: service.cluster
      value: XXXX
      action: insert
    - key: cluster
      value: XXXX
      action: insert

exporters:
  debug:
    verbosity: detailed

....
....

The attribute service.cluster will be injected as labels.service_cluster while cluster in labels.cluster

What did you expect to see?
service.cluster: XXXX

What did you see instead?
labels.service_cluster:XXXX or
labels.cluster: XXXX

What version did you use?
0.108.0

Environment
openshift

Additional context

ScopeSpans SchemaURL: 
...
Span #0
    Trace ID       : 2760dc4ca9976b747cc7752ee79f36b9
    Parent ID      : 
    .....
    Status message : 
Attributes:
     -> http.scheme: Str(https)
     -> http.client_ip: Str(172.16.8.1)
     -> kong.request.id: Str(f71b580eba670e4c66d6902551bcdd61)
     -> http.method: Str(GET)
     .....   
ResourceSpans #1
Resource SchemaURL: 
Resource attributes:
     -> service.name:xxxxx
     -> service.version: xxxxx
     -> service.instance.id: xxxxx
     -> deployment.environment: Str(dev)
     -> service.cluster: xxxx
     -> customer: xxxxx