Reported + Go Collector

✓ Guardrail ↓ Collector Stable Testing And Quality

Enforce Reported using data collected by Go Collector. Automatically check testing and quality standards on every PR.

Guardrail: Ensures that a coverage percentage is available and reported. Fails if coverage runs but the percentage metric is not captured.

Data Source: Analyze Go projects to collect module info, dependencies, test coverage, and golangci-lint results. Enforce Go-specific engineering standards.

Get Started View on GitHub

How Go Collector Powers This Guardrail

The Go Collector gathers metadata from your languages, build systems. This data flows into Lunar's Component JSON, where the Reported guardrail evaluates it against your standards.

When enabled, this check runs automatically on every PR and in AI coding workflows, providing real-time enforcement with actionable feedback.

↓ Go Collector Gathers Data Collector

Extracts metadata from code, configs, and tool outputs

{ } Component JSON

Data centralized in structured format for evaluation

✓ Reported Checks Guardrail

Pass/fail result with actionable feedback in PRs

Quick Start Configuration

Add both the collector and policy to your lunar-config.yml to enable this guardrail.

📄 lunar-config.yml

# Step 1: Enable the Go Collector
collectors:
  - uses: github://earthly/lunar-lib/collectors/golang@v1.0.0
    # with: ...

# Step 2: Enable the Coverage Guardrails
policies:
  - uses: github://earthly/lunar-lib/policies/coverage@v1.0.0
    include: [reported]
    # with: ...

What Go Collector Collects

This collector gathers the following data that the Reported guardrail evaluates.

Collector ci-before-command

`cicd`

Records every Go command executed in CI pipelines along with the Go version. Writes command strings and version info to .lang.go.cicd for audit trails and build reproducibility analysis.

Collector ci-before-command

`test-scope`

Determines whether go test runs recursively (./...) or targets specific packages. Writes scope to .lang.go.tests.scope as "recursive" or "package" to verify comprehensive test execution in CI.

Collector ci-after-command

`test-coverage`

Extracts coverage percentage from go test -coverprofile output after tests complete. Parses the coverage profile file, runs go tool cover -func to calculate total percentage, and writes results to .lang.go.tests.coverage including the raw profile.

Collector code

`project`

Analyzes Go project structure by detecting go.mod, go.sum, vendor directory, and goreleaser configuration. Extracts the module path and Go version from go.mod using go list. Writes project metadata to .lang.go with build system info.

View all 6 collectors in Go Collector →

Example Data Flow

Here's an example of the data that Go Collector writes to the Component JSON, which Reported then evaluates.

{ } component.json From Go Collector

{
  "lang": {
    "go": {
      "module": "github.com/acme/myproject",
      "version": "1.21",
      "build_systems": ["go"],
      "native": {
        "go_mod": { "exists": true, "version": "1.21" },
        "go_sum": { "exists": true },
        "vendor": { "exists": false },
        "goreleaser": { "exists": true },
        "golangci_lint": {
          "passed": false,
          "config_exists": true,
          "exit_code": 1,
          "output": "main.go:42:5: unused variable 'x' (unused)"
        }
      },
      "source": { "tool": "go", "integration": "code" },
      "cicd": {
        "cmds": [{ "cmd": "go test ./...", "version": "1.21.5" }],
        "source": { "tool": "go", "integration": "ci" }
      },
      "tests": {
        "scope": "recursive",
        "coverage": {
          "percentage": 78.5,
          "profile_path": "coverage.out",
          "source": { "tool": "go cover", "integration": "ci" }
        }
      },
      "dependencies": {
        "direct": [
          { "path": "github.com/stretchr/testify", "version": "v1.8.4", "indirect": false }
        ],
        "transitive": [
          { "path": "github.com/davecgh/go-spew", "version": "v1.1.1", "indirect": true }
        ],
        "source": { "tool": "go mod", "integration": "code" }
      },
      "lint": {
        "warnings": [
          { "file": "main.go", "line": 42, "column": 5, "message": "unused variable 'x'", "linter": "unused" }
        ],
        "linters": ["golangci-lint"],
        "source": { "tool": "golangci-lint", "integration": "code" }
      }
    }
  }
}

Configuration Options

Go Collector Inputs

Input	Required	Default	Description
`lint_timeout`	Optional	`10m`	Timeout for golangci-lint (e.g., 5m, 10m)

Coverage Guardrails Inputs

Input	Required	Default	Description
`min_coverage`	Optional	`80`	Minimum required coverage percentage

Learn More

Guardrail · Coverage Guardrails Reported View all compatible integrations

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Collector Go Collector View full documentation

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