Susana Ferreira a9180d406e feat(scripts/metricsdocgen): add AST scanner core for metrics doc generation (#21460) ...

## Description

This PR adds an AST-based scanner to automatically generate Prometheus metrics documentation from the coder source code.

## Changes

* Add `scripts/metricsdocgen/scanner/scanner.go` with:
  * Directory walking for `agent/`, `coderd/`, `enterprise/`, `provisionerd/`
  * Go file parsing (skipping `*_test.go` files)
  * AST inspection for metric extraction
  * `Metric.String()` for Prometheus text exposition format rendering
  * `writeMetrics()` to output metrics to stdout
  * Placeholder `extractMetricFromCall()` (implemented in subsequent PRs)
* Empty `scripts/metricsdocgen/generated_metrics` placeholder (populated by subsequent PRs)

**Note:** To facilitate the review process, this was separated into scoped stacked PRs. The division was based on the main structure, the different Prometheus patterns currently present in the codebase, and updates to the build process.

Related to: https://github.com/coder/coder/issues/13223

**Disclosure:** This PR was mainly developed with Claude Sonnet 4, with iterative review and refinement by @ssncferreira

2026-02-13 10:48:55 +00:00

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