[processor/resourcedetection] Add support for host cpuinfo attributes

[ChrsMark]

Description: : Added support for host's cpuinfo attributes
as part of the system resourcedetection. This information
is retrieved from /proc/cpuinfo.

Link to tracking Issue: #26532

Testing:

How to test this manually

1. Using the following configuration:

receivers:
  hostmetrics:
    collection_interval: 30s
    scrapers:
      cpu:

processors:
  resourcedetection/system:
    detectors: ["system"]
    system:
      hostname_sources: ["lookup", "cname", "dns", "os"]
      resource_attributes:
        host.name:
          enabled: true
        host.id:
          enabled: true
        host.cpu.cache.l2.size:
          enabled: true
        host.cpu.family:
          enabled: true
        host.cpu.model.id:
          enabled: true
        host.cpu.model.name:
          enabled: true
        host.cpu.stepping:
          enabled: true
        host.cpu.vendor.id:
          enabled: true

service:
  pipelines:
    metrics:
      receivers: [hostmetrics]
      exporters: [file]
      processors: [resourcedetection/system]

exporters:
  file:
    path: ./output.json

2. Start the collector with ./bin/otelcontribcol_linux_amd64 --config examples/host_config.yaml
3. The output reports the added attributes succesfully:

  {
    "resourceMetrics":[
      {
        "resource":{
          "attributes":[
            {
              "key":"host.name",
              "value":{
                "stringValue":"chrismark-ThinkPad-X1-Carbon-Gen-9"
              }
            },
            {
              "key":"os.type",
              "value":{
                "stringValue":"linux"
              }
            },
            {
              "key":"host.id",
              "value":{
                "stringValue":"d6488716404e4ce4854ff0e230944c6d"
              }
            },
            {
              "key":"host.cpu.vendor.id",
              "value":{
                "stringValue":"GenuineIntel"
              }
            },
            {
              "key":"host.cpu.family",
              "value":{
                "stringValue":"6"
              }
            },
            {
              "key":"host.cpu.model.id",
              "value":{
                "stringValue":"140"
              }
            },
            {
              "key":"host.cpu.model.name",
              "value":{
                "stringValue":"11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz"
              }
            },
            {
              "key":"host.cpu.stepping",
              "value":{
                "intValue":"1"
              }
            },
            {
              "key":"host.cpu.cache.l2.size",
              "value":{
                "intValue":"12288"
              }
            }
          ]
        },
        "scopeMetrics":[...],
        "schemaUrl":"https://opentelemetry.io/schemas/1.9.0"
      }
    ]
  }

Unit tests

Documentation: Updated README.md

[mx-psi]

# github.com/open-telemetry/opentelemetry-collector-contrib/processor/resourcedetectionprocessor/internal/system
Error: internal/system/system.go:152:20: fmt.Errorf call has arguments but no formatting directives
Error: internal/system/system.go:158:20: fmt.Errorf call has arguments but no formatting directives

Some stray files

[ChrsMark]

Thanks for the reviews @mx-psi ! The leftovers are now addressed and the CI is happy. Feel to free to have another look :).

[mx-psi]

Will wait a few days before merging to give @dmitryax and @frzifus a chance to have a look