The Prometheus monitoring system and time series database.

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Julien 75f94903b3 Add OpenAPI 3.2 specification generation for Prometheus HTTP API (#17825) ... * Add OpenAPI 3.2 specification generation for Prometheus HTTP API This commit introduces an OpenAPI specification for the Prometheus API. After testing multiple code-generation servers with built-in APIs, this implementation uses an independent spec file outside of the critical path. This spec file is tested with a framework present in this pull request. The specification helps clients know which parameters they can use and is served at /api/v1/openapi.yaml. The spec file will evolve with the Prometheus API and has the same version number. Downstream projects can tune the APIs presented in the spec file with configuration options using the IncludePaths setting for path filtering. In the future, there is room to generate a server from this spec file (e.g. with interfaces), but this is out of scope for this pull request. Architecture: - Core OpenAPI infrastructure (openapi.go): Dynamic spec building, caching, and thread-safe spec generation - Schema definitions (openapi_schemas.go): Complete type definitions for all API request and response types - Path specifications (openapi_paths.go): Endpoint definitions with parameters, request bodies, and response schemas - Examples (openapi_examples.go): Realistic request/response examples - Helper functions (openapi_helpers.go): Reusable builders for common OpenAPI structures Testing: - Comprehensive test suite with golden file validation - Test helpers package for API testing infrastructure - OpenAPI compliance validation utilities The golden file captures the complete specification for snapshot testing. Update with: go test -run TestOpenAPIGolden -update-openapi-spec REVIEWERS: The most important thing to check would be the OpenAPI golden file (web/api/v1/testdata/openapi_golden.yaml). Test scenarios are important as they test the actual OpenAPI spec validity. Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> * Add OpenAPI 3.1 support with version selection Add support for both OpenAPI 3.1 and 3.2 specifications with version selection via openapi_version query parameter. Defaults to 3.1 for broader compatibility Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> * Enhance OpenAPI examples and add helper functions - Add timestampExamples helper for consistent time formatting - Add exampleMap helper to simplify example creation - Improve example summaries with query details - Add matrix result example for range vector queries Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> * web/api: Add AtST method to test helper iterators Implement the AtST() method required by chunkenc.Iterator interface for FakeSeriesIterator and FakeHistogramSeriesIterator test helpers. The method returns 0 as these test helpers don't use start timestamps Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> * OpenAPI: Add minimum coverage test Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> * OpenAPI: Improve examples handling Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com> --------- Signed-off-by: Julien Pivotto <291750+roidelapluie@users.noreply.github.com>		3 weeks ago
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tools	Add OpenAPI 3.2 specification generation for Prometheus HTTP API (#17825)	3 weeks ago