Merge branch 'mrchrisw/mysql-connection-warn' into 'master'

Update warn message for MySQL fix

ZD: https://gitlab.zendesk.com/agent/tickets/39529

The current warn message is ambiguous. We should mention MySQL.

See merge request !6582

config/initializers/connection_fix.rb

@@ -20,7 +20,7 @@ if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
         execute_without_retry(*args)
       rescue ActiveRecord::StatementInvalid => e
         if e.message =~ /server has gone away/i
-          warn "Server timed out, retrying"
+          warn "Lost connection to MySQL server during query"
           reconnect!
           retry
         else