Set event fingerprint for exceptions relating to external services

config/initializers/sentry.rb

@@ -9,12 +9,21 @@ Sentry.init do |config|
   # We recommend adjusting this value in production
   config.traces_sample_rate = 0.25
 
+  exception_fingerprints = {
+    Excon::Error::ServiceUnavailable => 'external-service',
+    Twitter::Error::InternalServerError => 'external-service',
+  }
   config.before_send do |event, hint|
     if hint[:exception].is_a?(Errors::Base)
       # These are used for user-facing errors, not when something goes wrong
       nil
     end
 
+    exception_class = hint[:exception].class.name
+    if exception_fingerprints.key?(exception_class)
+      event.fingerprint = [exception_fingerprints[hint[:exception].class.name]]
+    end
+
     event
   end
 end