fix(rubygems): Don't throw on metadata errors (#23224)

lib/modules/datasource/rubygems/metadata-cache.spec.ts

@@ -192,7 +192,7 @@ describe('modules/datasource/rubygems/metadata-cache', () => {
     });
   });
 
-  it('throws on unknown error', async () => {
+  it('returns fallback result on unknown error', async () => {
     const cache = new MetadataCache(new Http('test'));
 
     httpMock
@@ -201,9 +201,14 @@ describe('modules/datasource/rubygems/metadata-cache', () => {
       .reply(500);
 
     const versions = ['1', '2', '3'];
+    const res = await cache.getRelease(
+      'https://rubygems.org',
+      'foobar',
+      versions
+    );
 
-    await expect(
-      cache.getRelease('https://rubygems.org', 'foobar', versions)
-    ).rejects.toThrow();
+    expect(res).toEqual({
+      releases: [{ version: '1' }, { version: '2' }, { version: '3' }],
+    });
   });
 });

lib/modules/datasource/rubygems/metadata-cache.ts

@@ -1,6 +1,7 @@
 import hasha from 'hasha';
+import { logger } from '../../../logger';
 import * as packageCache from '../../../util/cache/package';
-import { Http, HttpError } from '../../../util/http';
+import type { Http } from '../../../util/http';
 import { joinUrlParts } from '../../../util/url';
 import type { ReleaseResult } from '../types';
 import { GemMetadata, GemVersions } from './schema';
@@ -62,12 +63,9 @@ export class MetadataCache {
       );
       return data;
     } catch (err) {
-      if (err instanceof HttpError && err.response?.statusCode === 404) {
-        const releases = versions.map((version) => ({ version }));
-        return { releases };
-      }
-
-      throw err;
+      logger.debug({ err }, 'Rubygems: failed to fetch metadata');
+      const releases = versions.map((version) => ({ version }));
+      return { releases };
     }
   }
 }