Add client reports for span drop counts

sentry-ruby/lib/sentry/client.rb

@@ -55,12 +55,20 @@ def capture_event(event, scope, hint = {})
 
       event_type = event.is_a?(Event) ? event.type : event["type"]
       data_category = Envelope::Item.data_category(event_type)
+
+      is_transaction = event.is_a?(TransactionEvent)
+      spans_before = is_transaction ? event.spans.size : 0
+
       event = scope.apply_to_event(event, hint)
 
       if event.nil?
         log_debug("Discarded event because one of the event processors returned nil")
         transport.record_lost_event(:event_processor, data_category)
+        transport.record_lost_event(:event_processor, 'span', num: spans_before + 1) if is_transaction
         return
+      elsif is_transaction
+        spans_delta = spans_before - event.spans.size
+        transport.record_lost_event(:before_send, data_category, num: spans_delta) if spans_delta > 0
       end
 
       if async_block = configuration.async
@@ -180,12 +188,18 @@ def send_event(event, hint = nil)
       end
 
       if event_type == TransactionEvent::TYPE && configuration.before_send_transaction
+        spans_before = event.is_a?(TransactionEvent) ? event.spans.size : 0
         event = configuration.before_send_transaction.call(event, hint)
 
         if event.nil?
           log_debug("Discarded event because before_send_transaction returned nil")
-          transport.record_lost_event(:before_send, data_category)
+          transport.record_lost_event(:before_send, 'transaction')
+          transport.record_lost_event(:before_send, 'span', num: spans_before + 1)
           return
+        else
+          spans_after = event.is_a?(TransactionEvent) ? event.spans.size : 0
+          spans_delta = spans_before - spans_after
+          transport.record_lost_event(:before_send, data_category, num: spans_delta) if spans_delta > 0
         end
       end
 

sentry-ruby/lib/sentry/envelope.rb

@@ -21,7 +21,7 @@ def type
       # rate limits and client reports use the data_category rather than envelope item type
       def self.data_category(type)
         case type
-        when 'session', 'attachment', 'transaction', 'profile' then type
+        when 'session', 'attachment', 'transaction', 'profile', 'span' then type
         when 'sessions' then 'session'
         when 'check_in' then 'monitor'
         when 'statsd', 'metric_meta' then 'metric_bucket'

sentry-ruby/lib/sentry/transaction.rb

@@ -266,6 +266,7 @@ def finish(hub: nil, end_timestamp: nil)
         is_backpressure = Sentry.backpressure_monitor&.downsample_factor&.positive?
         reason = is_backpressure ? :backpressure : :sample_rate
         hub.current_client.transport.record_lost_event(reason, 'transaction')
+        hub.current_client.transport.record_lost_event(reason, 'span')
       end
     end
 

sentry-ruby/lib/sentry/transport.rb

@@ -151,11 +151,11 @@ def envelope_from_event(event)
       envelope
     end
 
-    def record_lost_event(reason, data_category)
+    def record_lost_event(reason, data_category, num: 1)
       return unless @send_client_reports
       return unless CLIENT_REPORT_REASONS.include?(reason)
 
-      @discarded_events[[reason, data_category]] += 1
+      @discarded_events[[reason, data_category]] += num
     end
 
     def flush