gitlab: add container-based config discovery support

[vitkyrka]

What does this PR do?

Adds container-based config discovery support to the gitlab integration.

We only support the OpenMetrics-based check, not the legacy check.

discovery only populates openmetrics_endpoint, not gitlab_url (which requires the GitLab base URL and can't be inferred from container introspection alone). GitlabCheckV2 already guards all gitlab_url-dependent behavior (readiness/liveness checks, version metadata, several tags) behind if self.config.gitlab_url: and logs a debug message otherwise, so the OpenMetrics scrape itself works correctly without it. test_e2e_discovery only asserts gitlab.openmetrics.health and metrics for this reason.

Motivation

DSCVR-535

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[datadog-datadog-prod-us1]

 

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 92.28% (+3.85%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: b92945e | Docs | Datadog PR Page | Give us feedback!}

[vitkyrka]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• gitlab: add container-based config discovery support #24324 👈 (View in Graphite)
• Propagate docker_run env vars to discovery-stability check's compose command #24533 : 3 other dependent PRs (#24479 , #24487 , #24494 )
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[vitkyrka]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: a3df0c7e6f

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[dd-octo-sts]

Validation Report

All 21 validations passed.

Show details

Validation	Description	Status
agent-reqs	Verify check versions match the Agent requirements file	✅
ci	Validate CI configuration and code coverage settings	✅
codeowners	Validate every integration has a CODEOWNERS entry	✅
config	Validate default configuration files against spec.yaml	✅
dep	Verify dependency pins are consistent and Agent-compatible	✅
http	Validate integrations use the HTTP wrapper correctly	✅
imports	Validate check imports do not use deprecated modules	✅
integration-style	Validate check code style conventions	✅
jmx-metrics	Validate JMX metrics definition files and config	✅
labeler	Validate PR labeler config matches integration directories	✅
legacy-signature	Validate no integration uses the legacy Agent check signature	✅
license-headers	Validate Python files have proper license headers	✅
licenses	Validate third-party license attribution list	✅
metadata	Validate metadata.csv metric definitions	✅
models	Validate configuration data models match spec.yaml	✅
openmetrics	Validate OpenMetrics integrations disable the metric limit	✅
package	Validate Python package metadata and naming	✅
qa-label	Validate the pull request declares whether it needs QA for the next Agent release	✅
readmes	Validate README files have required sections	✅
saved-views	Validate saved view JSON file structure and fields	✅
version	Validate version consistency between package and changelog	✅

View full run