PERF: Don't do initialization for every DB if RAILS_DB is set (#28668)

config/initializers/100-logster.rb

@@ -81,7 +81,7 @@ store.redis_prefix = Proc.new { redis.namespace }
 store.redis_raw_connection = redis.without_namespace
 severities = [Logger::WARN, Logger::ERROR, Logger::FATAL, Logger::UNKNOWN]
 
-RailsMultisite::ConnectionManagement.each_connection do
+RailsMultisite::ConnectionManagement.safe_each_connection do
   error_rate_per_minute =
     begin
       SiteSetting.alert_admins_if_errors_per_minute

lib/freedom_patches/rails_multisite.rb

@@ -2,8 +2,16 @@
 
 module RailsMultisite
   class ConnectionManagement
+    def self.each_active_connection(&blk)
+      if ENV["RAILS_DB"]
+        blk.call(current_db)
+      else
+        each_connection(&blk)
+      end
+    end
+
     def self.safe_each_connection
-      self.each_connection do |db|
+      each_active_connection do |db|
         begin
           yield(db) if block_given?
         rescue PG::ConnectionBad, PG::UnableToSend, PG::ServerError