Ignore peek-related backtrace lines

When generating performance_bar stats, all peek-related
wrapped calls are now ignored because now we wrap peek connections
in additional methods.

lib/gitlab/performance_bar/stats.rb

@@ -5,6 +5,11 @@ module Gitlab
     # This class fetches Peek stats stored in redis and logs them in a
     # structured log (so these can be then analyzed in Kibana)
     class Stats
+      IGNORED_BACKTRACE_LOCATIONS = %w[
+        ee/lib/ee/peek
+        lib/peek
+      ].freeze
+
       def initialize(redis)
         @redis = redis
       end
@@ -53,7 +58,8 @@ module Gitlab
       end
 
       def parse_backtrace(backtrace)
-        return unless match = /(?<filename>.*):(?<filenum>\d+):in `(?<method>.*)'/.match(backtrace.first)
+        return unless backtrace_row = find_caller(backtrace)
+        return unless match = /(?<filename>.*):(?<filenum>\d+):in `(?<method>.*)'/.match(backtrace_row)
 
         {
           filename: match[:filename],
@@ -65,6 +71,12 @@ module Gitlab
         }
       end
 
+      def find_caller(backtrace)
+        backtrace.find do |line|
+          !line.start_with?(*IGNORED_BACKTRACE_LOCATIONS)
+        end
+      end
+
       def logger
         @logger ||= Gitlab::PerformanceBar::Logger.build
       end

spec/fixtures/lib/gitlab/performance_bar/peek_data.json

@@ -13,6 +13,8 @@
           "duration": 1.096,
           "sql": "SELECT COUNT(*) FROM ((SELECT \"badges\".* FROM \"badges\" WHERE \"badges\".\"type\" = 'ProjectBadge' AND \"badges\".\"project_id\" = 8)\nUNION\n(SELECT \"badges\".* FROM \"badges\" WHERE \"badges\".\"type\" = 'GroupBadge' AND \"badges\".\"group_id\" IN (SELECT \"namespaces\".\"id\" FROM \"namespaces\" WHERE \"namespaces\".\"type\" = 'Group' AND \"namespaces\".\"id\" = 28))) badges",
           "backtrace": [
+            "ee/lib/ee/peek/views/active_record.rb:11:in `generate_detail'",
+            "lib/peek/views/active_record.rb:42:in `block in setup_subscribers'",
             "lib/gitlab/pagination/offset_pagination.rb:53:in `add_pagination_headers'",
             "lib/gitlab/pagination/offset_pagination.rb:15:in `block in paginate'",
             "lib/gitlab/pagination/offset_pagination.rb:14:in `tap'",