feat: add karafka processing_lag to event (#613)

lib/honeybadger/plugins/karafka.rb

@@ -6,9 +6,9 @@ module Plugins
       requirement { defined?(::Karafka) && ::Karafka.respond_to?(:monitor) }
 
       execution do
-        ::Karafka.monitor.subscribe('error.occurred') do |event|
+        ::Karafka.monitor.subscribe("error.occurred") do |event|
           Honeybadger.notify(event[:error])
-          Honeybadger.event('error.occurred', error: event[:error]) if config.load_plugin_insights?(:karafka)
+          Honeybadger.event("error.occurred.karafka", error: event[:error]) if config.load_plugin_insights?(:karafka)
         end
 
         if config.load_plugin_insights?(:karafka)
@@ -19,10 +19,11 @@ module Plugins
               id: event.payload[:caller].id,
               topic: event.payload[:caller].messages.metadata.topic,
               messages_count: event.payload[:caller].messages.metadata.size,
+              processing_lag: event.payload[:caller].messages.metadata.processing_lag,
               partition: event.payload[:caller].messages.metadata.partition
             }
 
-            Honeybadger.event('consumer.consumed.karafka', context)
+            Honeybadger.event("consumer.consumed.karafka", context)
           end
         end
       end