[dmt] Remove ignoring of _RU.md

pkg/linters/docs/README.md

@@ -115,9 +115,9 @@ For every English documentation file in the `docs/` directory, a corresponding R
 **What it checks:**
 
 1. Scans all `.md` files in the `docs/` directory (top-level only)
-2. For each English documentation file, checks for a corresponding `.ru.md` or `_RU.md` file
+2. For each English documentation file, checks for a corresponding `.ru.md` file
 3. Validates that Russian counterparts exist for all documentation files
-4. Ignores files that are already Russian (ending in `.ru.md` or `_RU.md`)
+4. Ignores files that are already Russian (ending in `.ru.md`)
 
 **Why it matters:**
 
@@ -159,15 +159,14 @@ my-module/
 my-module/
 └── docs/
     ├── README.md                 # English version
-    ├── README_RU.md              # Russian translation (legacy format)
+    ├── README.ru.md              # Russian translation (legacy format)
     ├── CONFIGURATION.md
-    └── CONFIGURATION_RU.md
+    └── CONFIGURATION.ru.md
 ```
 
 **Supported file naming conventions:**
 
-- **Preferred:** `FILENAME.ru.md` (e.g., `README.ru.md`, `FAQ.ru.md`)
-- **Legacy:** `FILENAME_RU.md` (e.g., `README_RU.md`, `FAQ_RU.md`) - case insensitive
+- `FILENAME.ru.md` (e.g., `README.ru.md`, `FAQ.ru.md`)
 
 **Configuration:**
 
@@ -196,7 +195,7 @@ English documentation files must not contain cyrillic characters. This rule scan
 **What it checks:**
 
 1. Scans all `.md` and `.markdown` files in `docs/` directory (top-level only)
-2. Skips files ending in `.ru.md` or `_RU.md` (Russian documentation)
+2. Skips files ending in `.ru.md` (Russian documentation)
 3. Detects cyrillic characters (А-Я, а-я, Ё, ё) in each line
 4. Reports exact line numbers and positions where cyrillic characters appear
 5. Provides visual indicators pointing to problematic characters
@@ -599,17 +598,12 @@ But you have `docs/README-RU.md` or `docs/README_ru.md` (lowercase).
 1. **Rename to the correct format:**
 
    ```bash
-   # Preferred format
    mv modules/my-module/docs/README-RU.md \
       modules/my-module/docs/README.ru.md
-
-   # Legacy format (also acceptable)
-   mv modules/my-module/docs/README-RU.md \
-      modules/my-module/docs/README_RU.md
    ```
 
 2. **Supported naming conventions:**
    - ✅ `FILENAME.ru.md` (preferred)
-   - ✅ `FILENAME_RU.md` (legacy, case insensitive)
+   - ❌ `FILENAME_RU.md` (legacy, not supported)
    - ❌ `FILENAME-RU.md` (not supported)
 

pkg/linters/docs/rules/bilingual.go

@@ -16,7 +16,6 @@ import (
 const (
 	BilingualRuleName = "bilingual"
 	RuSuffix          = ".ru.md"
-	RuFallbackSuffix  = "_ru.md"
 )
 
 func NewBilingualRule() *BilingualRule {
@@ -61,10 +60,6 @@ func (r *BilingualRule) CheckBilingual(m pkg.Module, errorList *errors.LintRuleE
 			continue
 		}
 
-		if strings.HasSuffix(strings.ToLower(rel), RuFallbackSuffix) {
-			rel = strings.ToLower(rel)
-		}
-
 		fileSet[rel] = struct{}{}
 	}
 
@@ -73,18 +68,12 @@ func (r *BilingualRule) CheckBilingual(m pkg.Module, errorList *errors.LintRuleE
 			continue
 		}
 
-		if !strings.HasSuffix(rel, ".md") || strings.HasSuffix(rel, RuFallbackSuffix) || strings.HasSuffix(rel, RuSuffix) {
+		if !strings.HasSuffix(rel, ".md") || strings.HasSuffix(rel, RuSuffix) {
 			continue
 		}
 
 		base := strings.TrimSuffix(rel, ".md")
 
-		// TODO: Delete it after renaming to .ru.md view
-		ruRelUpper := strings.ToLower(base) + RuFallbackSuffix
-		if _, fallbackOk := fileSet[ruRelUpper]; fallbackOk {
-			continue
-		}
-
 		ruRel := base + RuSuffix
 		if _, ok := fileSet[ruRel]; !ok {
 			errorList.

pkg/linters/docs/rules/cyrillic_in_english.go

@@ -24,7 +24,6 @@ var (
 	cyrPointerRe       = regexp.MustCompile(`[А-Яа-яЁё]`)
 	cyrFillerRe        = regexp.MustCompile(`[^А-Яа-яЁё]`)
 	russianDocRe       = regexp.MustCompile(`\.ru\.md$`)
-	russianDocUpperRe  = regexp.MustCompile(`(?i)_ru\.md$`)
 	markdownExtensions = []string{".md", ".markdown"}
 )
 
@@ -74,11 +73,6 @@ func (r *CyrillicInEnglishRule) checkFile(m pkg.Module, fileName string, errorLi
 		return
 	}
 
-	// TODO: Delete it after renaming to .ru.md view
-	if russianDocUpperRe.MatchString(fileName) {
-		return
-	}
-
 	lines, err := getFileContent(fileName)
 	if err != nil {
 		errorList.WithFilePath(relPath).WithValue(err.Error()).Error("failed to read file")

pkg/linters/no-cyrillic/README.md

@@ -36,7 +36,6 @@ The linter intelligently skips files where cyrillic is expected or acceptable:
 - **Russian documentation**: Files matching patterns:
   - `doc-ru-*.yaml` or `doc-ru-*.yml` - Russian documentation files
   - `*.ru.yaml`, `*.ru.yml`, `*.ru.json`, `*.ru.md`, `*.ru.html` - Russian localized files (e.g. `CHANGELOG/v0.3.21.ru.yml`)
-  - `*_RU.md` - Russian markdown files
   - `*_ru.html` - Russian HTML files
   - Files in `docs/site/` or `docs/documentation/`
   - Files in `tools/spelling/`

pkg/linters/no-cyrillic/rules/files_test.go

@@ -54,8 +54,8 @@ func TestFilesRule_CheckFile_SkipPatterns(t *testing.T) {
 		{name: "ru md suffix", relPath: "guide.ru.md", wantSkipped: true},
 		{name: "ru html suffix", relPath: "page.ru.html", wantSkipped: true},
 
-		// *_RU.md and *_ru.html
-		{name: "RU md suffix", relPath: "README_RU.md", wantSkipped: true},
+		// *.ru.md and *_ru.html
+		{name: "RU md suffix", relPath: "README.ru.md", wantSkipped: true},
 		{name: "ru html underscore", relPath: "index_ru.html", wantSkipped: true},
 
 		// docs/site and docs/documentation underscore-prefixed includes
@@ -228,7 +228,7 @@ func TestFilesRule_CheckFile_SkipRussianFile(t *testing.T) {
 
 	// Create test directory structure
 	tempDir := t.TempDir()
-	testFile := filepath.Join(tempDir, "README_RU.md")
+	testFile := filepath.Join(tempDir, "README.ru.md")
 
 	// Create a Russian file with cyrillic content (should be skipped)
 	err := os.WriteFile(testFile, []byte("# Документация\nПривет мир\n"), 0600)

test/e2e/README.md

@@ -96,7 +96,7 @@ go test ./test/e2e/ -run 'TestE2E/<linter>/<your-case>' -v
 | `module/missing-metadata` | module linter (definition-file, helmignore) + documentation linter (readme) |
 | `no-cyrillic/in-template` | no-cyrillic linter (Cyrillic characters in a yaml file) |
 | `no-cyrillic/skip-russian-files` | no-cyrillic linter skips Russian localized files (`*.ru.yml`, `*.ru.yaml`, `*.ru.json`, `doc-ru-*.yml`) while still reporting a regular Cyrillic template |
-| `no-cyrillic/skip-filenames-extensions` | no-cyrillic linter skips every filename/path pattern (`doc-ru-*`, `*.ru.{yaml,yml,json,md,html}`, `*_RU.md`, `docs/site/_*`, `docs/documentation/_*`, `tools/spelling/*`, `openapi/conversions/*`, `module.yaml`, `i18n/*`, `ru.*`) and non-scanned extensions (`.txt`), reporting only one genuine Cyrillic template |
+| `no-cyrillic/skip-filenames-extensions` | no-cyrillic linter skips every filename/path pattern (`doc-ru-*`, `*.ru.{yaml,yml,json,md,html}`, `docs/site/_*`, `docs/documentation/_*`, `tools/spelling/*`, `openapi/conversions/*`, `module.yaml`, `i18n/*`, `ru.*`) and non-scanned extensions (`.txt`), reporting only one genuine Cyrillic template |
 | `rbac/wildcards` | rbac linter (wildcards in a Role) |
 | `hooks/ingress` | hooks linter (Ingress without copy_custom_certificate hook) |
 | `openapi/bilingual` | openapi linter (missing doc-ru- translation, missing CRD module label) |

test/e2e/testdata/no-cyrillic/skip-filenames-extensions/expected.yaml

@@ -1,7 +1,7 @@
 description: >
   Comprehensive coverage of the no-cyrillic files rule skip logic. The module
   contains Cyrillic in many files that must be skipped by filename/path
-  (doc-ru-*, *.ru.{yaml,yml,json,md,html}, *_RU.md, *_ru.html, docs/site/_*,
+  (doc-ru-*, *.ru.{yaml,yml,json,md,html}, *_ru.html, docs/site/_*,
   docs/documentation/_*, tools/spelling/*, openapi/conversions/*, module.yaml,
   i18n/*, and the new ru.* prefix) as well as in files whose extensions are not
   scanned at all (.txt). Only a single regular template with Cyrillic must be