Merge branch 'bvl-search-count-optimizations' into 'master'

Decrease the default fast statement timeout

See merge request gitlab-org/gitlab!81270

app/controllers/search_controller.rb

@@ -25,6 +25,7 @@ class SearchController < ApplicationController
 
   feature_category :global_search
   urgency :high, [:opensearch]
+  urgency :low, [:count]
 
   def show
     @project = search_service.project

app/models/application_record.rb

@@ -60,8 +60,10 @@ class ApplicationRecord < ActiveRecord::Base
   end
 
   # Start a new transaction with a shorter-than-usual statement timeout. This is
-  # currently one third of the default 15-second timeout
-  def self.with_fast_read_statement_timeout(timeout_ms = 5000)
+  # currently one third of the default 15-second timeout with a 500ms buffer
+  # to allow callers gracefully handling the errors to still complete within
+  # the 5s target duration of a low urgency request.
+  def self.with_fast_read_statement_timeout(timeout_ms = 4500)
     ::Gitlab::Database::LoadBalancing::Session.current.fallback_to_replicas_for_ambiguous_queries do
       transaction(requires_new: true) do # rubocop:disable Performance/ActiveRecordSubtransactions
         connection.exec_query("SET LOCAL statement_timeout = #{timeout_ms}")