service discovery: Add operator support

[guyarb]

What does this PR do?

Adds service-discovery check to the operator.

Motivation

Allow to control service-discovery from the operator.

Additional Notes

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: v7.58.0
• Cluster Agent: N/A

Describe your test plan

• Create kind cluster
• Follow instructions installations instructions https://github.com/DataDog/datadog-operator/blob/main/docs/how-to-contribute.md#testing-the-operator-for-development
• Use the following configuration

  apiVersion: datadoghq.com/v2alpha1
  kind: DatadogAgent
  metadata:
    name: datadog
  spec:
    global:
      env:
        - name: DD_HOSTNAME
          value: "example-kind"
      clusterName: my-example-cluster
      credentials:
        apiSecret:
          secretName: datadog-secret
          keyName: api-key
        appSecret:
          secretName: datadog-secret
          keyName: app-key
    features:
      serviceDiscovery:
        enabled: true
    override:
      nodeAgent:
        image:
          tag: 7.58.0-rc.10-linux-jmx
  

• Use api key to ddstaging
• Wait 5m and check you have entries in https://ddstaging.datadoghq.com/ddsql/editor?q=SELECT%20%0A%20%20%20%20a.%2A%0AFROM%20%0A%20%20%20%20discovered_service%20AS%20a%0Awhere%20a.host_name%20%3D%20%27host-kind%27%0AORDER%20BY%20%0A%20%20%20%20a.start_time&query_timeframe_end=1728826119007&query_timeframe_mode=sliding&query_timeframe_start=1728822519007

Checklist

• [x] PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• [x] PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 73.33333% with 20 lines in your changes missing coverage. Please review.

Project coverage is 48.95%. Comparing base (009f82d) to head (9757d42).

Files with missing lines	Patch %	Lines
...r/datadogagent/feature/servicediscovery/feature.go	83.33%	9 Missing and 1 partial :warning:
internal/controller/testutils/agent.go	0.00%	10 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1449      +/-   ##
==========================================
+ Coverage   48.86%   48.95%   +0.09%     
==========================================
  Files         225      226       +1     
  Lines       19959    20034      +75     
==========================================
+ Hits         9753     9808      +55     
- Misses       9695     9714      +19     
- Partials      511      512       +1     

Flag	Coverage Δ
unittests	48.95% <73.33%> (+0.09%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
api/datadoghq/v2alpha1/datadogagent_default.go	89.88% <100.00%> (+0.14%)	:arrow_up:
api/datadoghq/v2alpha1/datadogagent_types.go	100.00% <ø> (ø)
internal/controller/datadogagent/controller.go	55.17% <ø> (ø)
...r/datadogagent/feature/servicediscovery/feature.go	83.33% <83.33%> (ø)
internal/controller/testutils/agent.go	0.00% <0.00%> (ø)

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[guyarb]

Test case didn't work for me, the query doesn't give me any results, is this expected?

Which hostname did you use? Did you verify the api key belongs with ddstaging?

Otherwise, change looks good. Confirmed trace-agent container and DD_SERVICE_DISCOVERY are added correctly.

The change does not affect trace-agent, but system-probe and agent

[levan-m]

I'm not sure what happened but today I can see data populated in the table. I tried both example-levan and example-kind. Regarding system-probe, sorry for confusion I misread the container name added after enabling the feature.