Merge branch '503490-frontend-sentry-alerts-are-noisy' into 'master'

Ignore Network errors reporting to Sentry

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/173389



Merged-by: Elwyn Benson <ebenson@gitlab.com>
Approved-by: Briley Sandlin <bsandlin@gitlab.com>
Approved-by: Elwyn Benson <ebenson@gitlab.com>
Co-authored-by: Miguel Rincon <mrincon@gitlab.com>

app/assets/javascripts/sentry/init_sentry.js

@@ -25,6 +25,12 @@ const initSentry = () => {
     environment: gon.sentry_environment,
     autoSessionTracking: true,
 
+    ignoreErrors: [
+      // Network errors create noise in Sentry and can't be fixed, ignore them.
+      /Network Error/i,
+      /NetworkError/i,
+    ],
+
     // Browser tracing configuration
     enableTracing: true,
     tracePropagationTargets: [/^\//], // only trace internal requests

spec/frontend/sentry/init_sentry_spec.js

@@ -67,6 +67,7 @@ describe('SentryConfig', () => {
             allowUrls: [mockGitlabUrl, 'webpack-internal://'],
             environment: mockEnvironment,
             autoSessionTracking: true,
+            ignoreErrors: [/Network Error/i, /NetworkError/i],
             enableTracing: true,
             tracePropagationTargets: [/^\//],
             tracesSampleRate: mockSentryClientsideTracesSampleRate,