Replace Bugsnag with Sentry (#8341)

* Replace Bugsnag with Sentry for error monitoring

Migrate error monitoring from Bugsnag to Sentry across both the Ruby
backend and JavaScript frontend. Uses Exercism.config.sentry_dsn for
backend config and env.json for frontend config, both production-only.

- Swap bugsnag gem for sentry-ruby + sentry-rails
- Swap @bugsnag/js + @bugsnag/plugin-react for @sentry/react
- Replace all Bugsnag.notify() calls with Sentry.capture_exception()
- Preserve Active Storage RecordNotFound filter via before_send
- Replace skip_bugsnag job pattern with retry_on + excluded_exceptions
- Update CSP connect policy for Sentry ingest domain
- Update GitHub labels from bot/bugsnag to bot/sentry

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Update Gemfile.lock and fix sentry test stubs

Run bundle install to remove bugsnag from lockfile and add sentry gems.
Fix Mocha stubbing errors in sentry_test.rb for cases where url is
never accessed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Add x86_64-linux platform to Gemfile.lock

CI runs on Linux and the lockfile only had the darwin platform after
the gem swap.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Use separate Sentry DSN config keys for Rails and JS

- Backend: Exercism.config.sentry_rails_dsn
- Frontend: Exercism.config.sentry_js_dsn (piped through env.json)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Sample JS errors: 100% logged-in, 1% logged-out

Use beforeSend to always capture errors from logged-in users (with
user ID attached) and sample only 1% of errors from logged-out users
to avoid excessive noise.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Filter dynamic import errors from Sentry (#8349)

These "Failed to fetch dynamically imported module" TypeErrors are
caused by transient network issues, ad blockers, or deploys
invalidating cached chunk names. They are not actionable and just
create noise.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: iHiD

.appends/.github/labels.yml

@@ -3,13 +3,13 @@
 # https://github.com/exercism/org-wide-files/blob/main/global-files/.github/labels.yml.     #
 # ----------------------------------------------------------------------------------------- #
 
-- name: "bot/bugsnag"
+- name: "bot/sentry"
   description: ""
-  color: "A32E92"
-  
-- name: "bot/bugsnag-clientside"
+  color: "362D59"
+
+- name: "bot/sentry-clientside"
   description: ""
-  color: "A32E92"
+  color: "362D59"
 
 - name: "dependencies"
   description: "Pull requests that update a dependency file"

.github/labels.yml

@@ -172,13 +172,13 @@
 # https://github.com/exercism/org-wide-files/blob/main/global-files/.github/labels.yml.     #
 # ----------------------------------------------------------------------------------------- #
 
-- name: "bot/bugsnag"
+- name: "bot/sentry"
   description: ""
-  color: "A32E92"
-  
-- name: "bot/bugsnag-clientside"
+  color: "362D59"
+
+- name: "bot/sentry-clientside"
   description: ""
-  color: "A32E92"
+  color: "362D59"
 
 - name: "dependencies"
   description: "Pull requests that update a dependency file"

Gemfile

@@ -27,7 +27,8 @@ gem 'rack-cors'
 
 # Helper gems for Rails
 gem 'bootsnap', '>= 1.4.2', require: false
-gem 'bugsnag'
+gem 'sentry-rails'
+gem 'sentry-ruby'
 
 # Interaction gems
 gem 'rugged'

Gemfile.lock

@@ -147,8 +147,6 @@ GEM
     bindex (0.8.1)
     bootsnap (1.18.6)
       msgpack (~> 1.2)
-    bugsnag (6.27.1)
-      concurrent-ruby (~> 1.0)
     builder (3.3.0)
     bullet (8.0.8)
       activesupport (>= 3.0.0)
@@ -230,6 +228,8 @@ GEM
     faraday_middleware (1.2.1)
       faraday (~> 1.0)
     ffi (1.17.2)
+    ffi (1.17.2-arm64-darwin)
+    ffi (1.17.2-x86_64-linux-gnu)
     friendly_id (5.4.2)
       activerecord (>= 4.0.0)
     fugit (1.11.1)
@@ -243,11 +243,23 @@ GEM
     google-protobuf (4.31.1)
       bigdecimal
       rake (>= 13)
+    google-protobuf (4.31.1-arm64-darwin)
+      bigdecimal
+      rake (>= 13)
+    google-protobuf (4.31.1-x86_64-linux-gnu)
+      bigdecimal
+      rake (>= 13)
     googleapis-common-protos-types (1.20.0)
       google-protobuf (>= 3.18, < 5.a)
     grpc (1.73.0)
       google-protobuf (>= 3.25, < 5.0)
       googleapis-common-protos-types (~> 1.0)
+    grpc (1.73.0-arm64-darwin)
+      google-protobuf (>= 3.25, < 5.0)
+      googleapis-common-protos-types (~> 1.0)
+    grpc (1.73.0-x86_64-linux)
+      google-protobuf (>= 3.25, < 5.0)
+      googleapis-common-protos-types (~> 1.0)
     haml (6.3.0)
       temple (>= 0.8.2)
       thor
@@ -354,6 +366,10 @@ GEM
     nokogiri (1.18.8)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
+    nokogiri (1.18.8-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.18.8-x86_64-linux-gnu)
+      racc (~> 1.4)
     oauth2 (2.0.12)
       faraday (>= 0.17.3, < 4.0)
       jwt (>= 1.0, < 4.0)
@@ -551,6 +567,12 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 3.0)
       websocket (~> 1.0)
+    sentry-rails (6.3.0)
+      railties (>= 5.2.0)
+      sentry-ruby (~> 6.3.0)
+    sentry-ruby (6.3.0)
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.0.2)
     show_me_the_cookies (6.0.0)
       capybara (>= 2, < 4)
     sidekiq (7.3.9)
@@ -634,8 +656,9 @@ GEM
     zeitwerk (2.7.3)
 
 PLATFORMS
-  ruby
+  arm64-darwin-23
   x64-mingw32
+  x86_64-linux
 
 DEPENDENCIES
   addressable (~> 2.7)
@@ -647,7 +670,6 @@ DEPENDENCIES
   aws-sdk-sesv2
   base64
   bootsnap (>= 1.4.2)
-  bugsnag
   bullet
   byebug
   capybara (>= 2.15)
@@ -701,6 +723,8 @@ DEPENDENCIES
   rubyzip (~> 2.3)
   rugged
   selenium-webdriver
+  sentry-rails
+  sentry-ruby
   show_me_the_cookies
   sidekiq (~> 7.2)
   sidekiq-failures

app/commands/document/search_docs.rb

@@ -32,7 +32,7 @@ def call
     Kaminari.paginate_array(docs, total_count:).
       page(page).per(per)
   rescue StandardError => e
-    Bugsnag.notify(e)
+    Sentry.capture_exception(e)
     Fallback.(criteria, track_slug, page, per)
   end
 

app/commands/exercise/approach/link_matching_submissions.rb

@@ -20,15 +20,15 @@ def relink_matched_submissions!
 
       Submission::LinkToMatchingApproach.defer(submission)
     rescue StandardError => e
-      Bugsnag.notify(e)
+      Sentry.capture_exception(e)
     end
   end
 
   def link_unmatched_submissions!
     Submission.has_iteration.tagged.where(exercise:, approach: nil).find_each do |submission|
       Submission::LinkApproach.(submission, approach) if approach.matches_tags?(submission.tags)
     rescue StandardError => e
-      Bugsnag.notify(e)
+      Sentry.capture_exception(e)
     end
   end
 

app/commands/git/sync_problem_specifications.rb

@@ -14,7 +14,7 @@ def call
         exercise.deprecated? ? :deprecated : :active
       )
     rescue StandardError => e
-      Bugsnag.notify(e)
+      Sentry.capture_exception(e)
     end
   end
 

app/commands/git/sync_tooling_invoker.rb

@@ -6,6 +6,6 @@ class Git::SyncToolingInvoker
   def call
     Git::ToolingInvoker.new.update!
   rescue StandardError => e
-    Bugsnag.notify(e)
+    Sentry.capture_exception(e)
   end
 end

app/commands/git/sync_tooling_manager.rb

@@ -6,6 +6,6 @@ class Git::SyncToolingManager
   def call
     Git::ToolingManager.new.update!
   rescue StandardError => e
-    Bugsnag.notify(e)
+    Sentry.capture_exception(e)
   end
 end

app/commands/git/sync_track.rb

@@ -30,7 +30,7 @@ def call
 
     # TODO: (Optional) consider raising error when slug in config is different from track slug
 
-    # TODO: (Optional) We should raise a bugsnag here too. Note: this is not needed if
+    # TODO: (Optional) We should raise a sentry error here too. Note: this is not needed if
     # we validate a track using configlet
     blurb = head_git_track.blurb[0, 350]