Synchronize common files from prometheus/prometheus

[prombot]

Propagating changes from prometheus/prometheus default branch.

Source can be found here.

Summary by CodeRabbit

• Chores
  • Updated build tooling to version 0.18.1
  • Standardized Dockerfile discovery process in build configuration

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: dd32d719-2aaa-4a7f-9b9c-eab71c24d91f

📥 Commits

Reviewing files that changed from the base of the PR and between d156470 and 41bf219.

📒 Files selected for processing (1)

• Makefile.common

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📝 Walkthrough

Walkthrough

Two environment variables in the build configuration are updated: PROMU_VERSION is bumped to 0.18.1 and DOCKERFILE_VARIANTS is refactored to use wildcard expansion for consistency in Dockerfile discovery.

Changes

Cohort / File(s)	Summary
Build Configuration Makefile.common	Updated PROMU_VERSION from 0.18.0 to 0.18.1; refactored DOCKERFILE_VARIANTS to use $(wildcard Dockerfile Dockerfile.*) instead of explicit Dockerfile literal with wildcard, ensuring consistent path resolution.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description is minimal but contextually appropriate for an automated sync. However, it lacks the structured format and required checklist items specified in the template.	Consider completing the PR checklist template to clarify whether this change affects tests, performance, or API compatibility, even if the answers are 'not applicable' for a sync operation.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main purpose of the PR—synchronizing common files from the upstream prometheus/prometheus repository.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch repo_sync

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