diff --git a/docs/release-notes/mongoid-9.0.txt b/docs/release-notes/mongoid-9.0.txt
index 653eb4dc20..89f6b6b55a 100644
--- a/docs/release-notes/mongoid-9.0.txt
+++ b/docs/release-notes/mongoid-9.0.txt
@@ -166,6 +166,33 @@ Deprecated functionality removed
 - The deprecated class ``Mongoid::Errors::InvalidStorageParent`` has been removed.
 
 
+Deprecated kernel monkey patch methods removed
+----------------------------------------------
+
+The following kernel monkey patch methods are removed. These were previously deprecated and were intended
+for internal Mongoid use only, so please refer to the Mongoid 8.x codebase for the implementation if
+you were using them.
+
+- ``Object#__sortable__``
+- ``Object#__find_args__``
+- ``Object#__setter__``
+- ``Object#__to_inc__``
+- ``Object#do_or_do_not``
+- ``Object#you_must``
+- ``Object#multi_arged?``
+- ``Object#regexp?``
+- ``Object.__mongoize_fk__``
+- ``Hash#__consolidate__``
+- ``Hash#delete_id``
+- ``Hash#extract_id``
+- ``Hash#to_criteria``
+- ``Mongoid::Criteria#to_criteria``
+- ``Integer#unconvertable_to_bson?``
+- ``String#unconvertable_to_bson?``
+- ``String#mongoid_id?``
+- ``Symbol#mongoid_id?``
+
+
 ``touch`` method now clears changed state
 -----------------------------------------
 
diff --git a/lib/mongoid/criteria.rb b/lib/mongoid/criteria.rb
index ca024cace9..5e4442cfba 100644
--- a/lib/mongoid/criteria.rb
+++ b/lib/mongoid/criteria.rb
@@ -364,18 +364,6 @@ def respond_to?(name, include_private = false)
 
     alias :to_ary :to_a
 
-    # Convenience for objects that want to be merged into a criteria.
-    #
-    # @example Convert to a criteria.
-    #   criteria.to_criteria
-    #
-    # @return [ Criteria ] self.
-    # @deprecated
-    def to_criteria
-      self
-    end
-    Mongoid.deprecate(self, :to_criteria)
-
     # Convert the criteria to a proc.
     #
     # @example Convert the criteria to a proc.
diff --git a/lib/mongoid/criteria/queryable/extensions/object.rb b/lib/mongoid/criteria/queryable/extensions/object.rb
index 32605781d4..831ad7c3f1 100644
--- a/lib/mongoid/criteria/queryable/extensions/object.rb
+++ b/lib/mongoid/criteria/queryable/extensions/object.rb
@@ -122,18 +122,6 @@ def __expand_complex__
             self
           end
 
-          # Is the object a regex.
-          #
-          # @example Is the object a regex?
-          #   obj.regexp?
-          #
-          # @return [ false ] Always false.
-          # @deprecated
-          def regexp?
-            false
-          end
-          Mongoid.deprecate(self, :regexp?)
-
           module ClassMethods
 
             # Evolve the object.
diff --git a/lib/mongoid/criteria/queryable/extensions/regexp.rb b/lib/mongoid/criteria/queryable/extensions/regexp.rb
index 514c564b26..57ba30639b 100644
--- a/lib/mongoid/criteria/queryable/extensions/regexp.rb
+++ b/lib/mongoid/criteria/queryable/extensions/regexp.rb
@@ -9,16 +9,6 @@ module Extensions
         # Adds query type-casting behavior to Regexp class.
         module Regexp
 
-          # Is the object a regexp?
-          #
-          # @example Is the object a regex?
-          #   /\A[123]/.regexp?
-          #
-          # @return [ true ] Always true.
-          # @deprecated
-          def regexp?; true; end
-          Mongoid.deprecate(self, :regexp?)
-
           module ClassMethods
 
             # Evolve the object into a regex.
@@ -39,16 +29,6 @@ def evolve(object)
           # Adds query type-casting behavior to BSON::Regexp::Raw class.
           module Raw_
 
-            # Is the object a regexp?
-            #
-            # @example Is the object a regex?
-            #   bson_raw_regexp.regexp?
-            #
-            # @return [ true ] Always true.
-            # @deprecated
-            def regexp?; true; end
-            Mongoid.deprecate(self, :regexp?)
-
             module ClassMethods
 
               # Evolve the object into a raw bson regex.
diff --git a/lib/mongoid/extensions/array.rb b/lib/mongoid/extensions/array.rb
index 0cf2a92d14..9639218c66 100644
--- a/lib/mongoid/extensions/array.rb
+++ b/lib/mongoid/extensions/array.rb
@@ -17,18 +17,6 @@ def __evolve_object_id__
         self
       end
 
-      # Get the array of args as arguments for a find query.
-      #
-      # @example Get the array as find args.
-      #   [ 1, 2, 3 ].__find_args__
-      #
-      # @return [ Array ] The array of args.
-      # @deprecated
-      def __find_args__
-        flat_map{ |a| a.__find_args__ }.uniq{ |a| a.to_s }
-      end
-      Mongoid.deprecate(self, :__find_args__)
-
       # Mongoize the array into an array of object ids.
       #
       # @example Evolve the array to object ids.
@@ -55,18 +43,6 @@ def __mongoize_time__
         ::Time.zone.local(*self)
       end
 
-      # Is the array a set of multiple arguments in a method?
-      #
-      # @example Is this multi args?
-      #   [ 1, 2, 3 ].multi_arged?
-      #
-      # @return [ true | false ] If the array is multi args.
-      # @deprecated
-      def multi_arged?
-        !first.is_a?(Hash) && first.resizable? || size > 1
-      end
-      Mongoid.deprecate(self, :multi_arged?)
-
       # Turn the object from the ruby type we deal with to a Mongo friendly
       # type.
       #
@@ -105,25 +81,6 @@ def resizable?
 
       module ClassMethods
 
-        # Convert the provided object to a proper array of foreign keys.
-        #
-        # @example Mongoize the object.
-        #   Array.__mongoize_fk__(constraint, object)
-        #
-        # @param [ Mongoid::Association::Relatable ] association The association metadata.
-        # @param [ Object ] object The object to convert.
-        #
-        # @return [ Array ] The array of ids.
-        # @deprecated
-        def __mongoize_fk__(association, object)
-          if object.resizable?
-            object.blank? ? object : association.convert_to_foreign_key(object)
-          else
-            object.blank? ? [] : association.convert_to_foreign_key(Array(object))
-          end
-        end
-        Mongoid.deprecate(self, :__mongoize_fk__)
-
         # Turn the object from the ruby type we deal with to a Mongo friendly
         # type.
         #
diff --git a/lib/mongoid/extensions/big_decimal.rb b/lib/mongoid/extensions/big_decimal.rb
index cce430f2bc..f837d2f4f8 100644
--- a/lib/mongoid/extensions/big_decimal.rb
+++ b/lib/mongoid/extensions/big_decimal.rb
@@ -14,18 +14,6 @@ def self.included(base)
         base.extend(ClassMethods)
       end
 
-      # Convert the big decimal to an $inc-able value.
-      #
-      # @example Convert the big decimal.
-      #   bd.__to_inc__
-      #
-      # @return [ Float ] The big decimal as a float.
-      # @deprecated
-      def __to_inc__
-        to_f
-      end
-      Mongoid.deprecate(self, :__to_inc__)
-
       # Turn the object from the ruby type we deal with to a Mongo friendly
       # type.
       #
diff --git a/lib/mongoid/extensions/false_class.rb b/lib/mongoid/extensions/false_class.rb
index d50e6a6b9d..30cc0df6a1 100644
--- a/lib/mongoid/extensions/false_class.rb
+++ b/lib/mongoid/extensions/false_class.rb
@@ -5,18 +5,6 @@ module Mongoid
   module Extensions
     # Adds type-casting behavior to FalseClass.
     module FalseClass
-      # Get the value of the object as a mongo friendly sort value.
-      #
-      # @example Get the object as sort criteria.
-      #   object.__sortable__
-      #
-      # @return [ Integer ] 0.
-      # @deprecated
-      def __sortable__
-        0
-      end
-      Mongoid.deprecate(self, :__sortable__)
-
       # Is the passed value a boolean?
       #
       # @example Is the value a boolean type?
diff --git a/lib/mongoid/extensions/hash.rb b/lib/mongoid/extensions/hash.rb
index 19aaef11af..a686645533 100644
--- a/lib/mongoid/extensions/hash.rb
+++ b/lib/mongoid/extensions/hash.rb
@@ -31,47 +31,6 @@ def __mongoize_object_id__
         end
       end
 
-      # Consolidate the key/values in the hash under an atomic $set.
-      # DEPRECATED. This was never intended to be a public API and
-      # the functionality will no longer be exposed once this method
-      # is eventually removed.
-      #
-      # @example Consolidate the hash.
-      #   { name: "Placebo" }.__consolidate__
-      #
-      # @return [ Hash ] A new consolidated hash.
-      #
-      # @deprecated
-      def __consolidate__(klass)
-        Mongoid::AtomicUpdatePreparer.prepare(self, klass)
-      end
-      Mongoid.deprecate(self, :__consolidate__)
-
-      # Deletes an id value from the hash.
-      #
-      # @example Delete an id value.
-      #   {}.delete_id
-      #
-      # @return [ Object ] The deleted value, or nil.
-      # @deprecated
-      def delete_id
-        delete("_id") || delete(:_id) || delete("id") || delete(:id)
-      end
-      Mongoid.deprecate(self, :delete_id)
-
-      # Get the id attribute from this hash, whether it's prefixed with an
-      # underscore or is a symbol.
-      #
-      # @example Extract the id.
-      #   { :_id => 1 }.extract_id
-      #
-      # @return [ Object ] The value of the id.
-      # @deprecated
-      def extract_id
-        self["_id"] || self[:_id] || self["id"] || self[:id]
-      end
-      Mongoid.deprecate(self, :extract_id)
-
       # Turn the object from the ruby type we deal with to a Mongo friendly
       # type.
       #
@@ -93,20 +52,6 @@ def resizable?
         true
       end
 
-      # Convert this hash to a criteria. Will iterate over each keys in the
-      # hash which must correspond to method on a criteria object. The hash
-      # must also include a "klass" key.
-      #
-      # @example Convert the hash to a criteria.
-      #   { klass: Band, where: { name: "Depeche Mode" }.to_criteria
-      #
-      # @return [ Criteria ] The criteria.
-      # @deprecated
-      def to_criteria
-        Criteria.from_hash(self)
-      end
-      Mongoid.deprecate(self, :to_criteria)
-
       private
 
       module ClassMethods
diff --git a/lib/mongoid/extensions/integer.rb b/lib/mongoid/extensions/integer.rb
index ec35ee97bd..3ea61b17f4 100644
--- a/lib/mongoid/extensions/integer.rb
+++ b/lib/mongoid/extensions/integer.rb
@@ -27,18 +27,6 @@ def numeric?
         true
       end
 
-      # Is the object not to be converted to bson on criteria creation?
-      #
-      # @example Is the object unconvertable?
-      #   object.unconvertable_to_bson?
-      #
-      # @return [ true ] If the object is unconvertable.
-      # @deprecated
-      def unconvertable_to_bson?
-        true
-      end
-      Mongoid.deprecate(self, :unconvertable_to_bson?)
-
       module ClassMethods
 
         # Turn the object from the ruby type we deal with to a Mongo friendly
diff --git a/lib/mongoid/extensions/nil_class.rb b/lib/mongoid/extensions/nil_class.rb
index 7cfc52a951..10dc3872ad 100644
--- a/lib/mongoid/extensions/nil_class.rb
+++ b/lib/mongoid/extensions/nil_class.rb
@@ -5,18 +5,6 @@ module Mongoid
   module Extensions
     # Adds type-casting behavior to NilClass.
     module NilClass
-      # Try to form a setter from this object.
-      #
-      # @example Try to form a setter.
-      #   object.__setter__
-      #
-      # @return [ nil ] Always nil.
-      # @deprecated
-      def __setter__
-        self
-      end
-      Mongoid.deprecate(self, :__setter__)
-
       # Get the name of a nil collection.
       #
       # @example Get the nil name.
diff --git a/lib/mongoid/extensions/object.rb b/lib/mongoid/extensions/object.rb
index 67b91bc987..baa865af41 100644
--- a/lib/mongoid/extensions/object.rb
+++ b/lib/mongoid/extensions/object.rb
@@ -20,71 +20,6 @@ def __evolve_object_id__
       end
       alias :__mongoize_object_id__ :__evolve_object_id__
 
-      # Convert the object to args for a find query.
-      #
-      # @example Convert the object to args.
-      #   object.__find_args__
-      #
-      # @return [ Object ] self.
-      # @deprecated
-      def __find_args__
-        self
-      end
-      Mongoid.deprecate(self, :__find_args__)
-
-      # Try to form a setter from this object.
-      #
-      # @example Try to form a setter.
-      #   object.__setter__
-      #
-      # @return [ String ] The object as a string plus =.
-      # @deprecated
-      def __setter__
-        "#{self}="
-      end
-      Mongoid.deprecate(self, :__setter__)
-
-      # Get the value of the object as a mongo friendly sort value.
-      #
-      # @example Get the object as sort criteria.
-      #   object.__sortable__
-      #
-      # @return [ Object ] self.
-      # @deprecated
-      def __sortable__
-        self
-      end
-      Mongoid.deprecate(self, :__sortable__)
-
-      # Conversion of an object to an $inc-able value.
-      #
-      # @example Convert the object.
-      #   1.__to_inc__
-      #
-      # @return [ Object ] The object.
-      # @deprecated
-      def __to_inc__
-        self
-      end
-      Mongoid.deprecate(self, :__to_inc__)
-
-
-      # Do or do not, there is no try. -- Yoda.
-      #
-      # @example Do or do not.
-      #   object.do_or_do_not(:use, "The Force")
-      #
-      # @param [ String | Symbol ] name The method name.
-      # @param [ Object... ] *args The arguments.
-      #
-      # @return [ Object | nil ] The result of the method call or nil if the
-      #   method does not exist.
-      # @deprecated
-      def do_or_do_not(name, *args)
-        send(name, *args) if name && respond_to?(name)
-      end
-      Mongoid.deprecate(self, :do_or_do_not)
-
       # Get the value for an instance variable or false if it doesn't exist.
       #
       # @example Get the value for an instance var.
@@ -113,18 +48,6 @@ def mongoize
         self
       end
 
-      # Is the object multi args.
-      #
-      # @example Is the object multi args?
-      #   object.multi_arged?
-      #
-      # @return [ false ] false.
-      # @deprecated
-      def multi_arged?
-        false
-      end
-      Mongoid.deprecate(self, :multi_arged?)
-
       # Is the object a number?
       #
       # @example Is the object a number?.
@@ -172,40 +95,7 @@ def substitutable
         self
       end
 
-      # You must unlearn what you have learned. -- Yoda
-      #
-      # @example You must perform this execution.
-      #   object.you_must(:use, "The Force")
-      #
-      # @param [ String | Symbol ] name The method name.
-      # @param [ Object... ] *args The arguments.
-      #
-      # @return [ Object | nil ] The result of the method call or nil if the
-      #   method does not exist. Nil if the object is frozen.
-      # @deprecated
-      def you_must(name, *args)
-        frozen? ? nil : do_or_do_not(name, *args)
-      end
-      Mongoid.deprecate(self, :you_must)
-
       module ClassMethods
-        # Convert the provided object to a foreign key, given the metadata key
-        # contstraint.
-        #
-        # @example Convert the object to a fk.
-        #   Object.__mongoize_fk__(association, object)
-        #
-        # @param [ Mongoid::Association::Relatable ] association The association metadata.
-        # @param [ Object ] object The object to convert.
-        #
-        # @return [ Object ] The converted object.
-        # @deprecated
-        def __mongoize_fk__(association, object)
-          return nil if !object || object == ""
-          association.convert_to_foreign_key(object)
-        end
-        Mongoid.deprecate(self, :__mongoize_fk__)
-
         # Convert the object from its mongo friendly ruby type to this type.
         #
         # @example Demongoize the object.
diff --git a/lib/mongoid/extensions/range.rb b/lib/mongoid/extensions/range.rb
index 190bd8aa81..1d480016e0 100644
--- a/lib/mongoid/extensions/range.rb
+++ b/lib/mongoid/extensions/range.rb
@@ -9,18 +9,6 @@ def self.included(base)
         base.extend(ClassMethods)
       end
 
-      # Get the range as arguments for a find.
-      #
-      # @example Get the range as find args.
-      #   range.__find_args__
-      #
-      # @return [ Array ] The range as an array.
-      # @deprecated
-      def __find_args__
-        to_a
-      end
-      Mongoid.deprecate(self, :__find_args__)
-
       # Turn the object from the ruby type we deal with to a Mongo friendly
       # type.
       #
diff --git a/lib/mongoid/extensions/string.rb b/lib/mongoid/extensions/string.rb
index b541b3adc9..be60d07f20 100644
--- a/lib/mongoid/extensions/string.rb
+++ b/lib/mongoid/extensions/string.rb
@@ -7,11 +7,6 @@ module Extensions
     # Adds type-casting behavior to String class.
     module String
 
-      # @attribute [rw] unconvertable_to_bson If the document is unconvertable.
-      # @deprecated
-      attr_accessor :unconvertable_to_bson
-      Mongoid.deprecate(self, :unconvertable_to_bson, :unconvertable_to_bson=)
-
       # Evolve the string into an object id if possible.
       #
       # @example Evolve the string.
@@ -63,18 +58,6 @@ def collectionize
         tableize.gsub("/", "_")
       end
 
-      # Is the string a valid value for a Mongoid id?
-      #
-      # @example Is the string an id value?
-      #   "_id".mongoid_id?
-      #
-      # @return [ true | false ] If the string is id or _id.
-      # @deprecated
-      def mongoid_id?
-        self =~ /\A(|_)id\z/
-      end
-      Mongoid.deprecate(self, :mongoid_id?)
-
       # Is the string a number? The literals "NaN", "Infinity", and "-Infinity"
       # are counted as numbers.
       #
@@ -128,19 +111,6 @@ def before_type_cast?
         ends_with?("_before_type_cast")
       end
 
-
-      # Is the object not to be converted to bson on criteria creation?
-      #
-      # @example Is the object unconvertable?
-      #   object.unconvertable_to_bson?
-      #
-      # @return [ true | false ] If the object is unconvertable.
-      # @deprecated
-      def unconvertable_to_bson?
-        @unconvertable_to_bson ||= false
-      end
-      Mongoid.deprecate(self, :unconvertable_to_bson?)
-
       private
 
       # If the string is a legal object id, convert it.
diff --git a/lib/mongoid/extensions/symbol.rb b/lib/mongoid/extensions/symbol.rb
index c37536e965..36e48c68ba 100644
--- a/lib/mongoid/extensions/symbol.rb
+++ b/lib/mongoid/extensions/symbol.rb
@@ -7,18 +7,6 @@ module Extensions
     # Adds type-casting behavior to Symbol class.
     module Symbol
 
-      # Is the symbol a valid value for a Mongoid id?
-      #
-      # @example Is the string an id value?
-      #   :_id.mongoid_id?
-      #
-      # @return [ true | false ] If the symbol is :id or :_id.
-      # @deprecated
-      def mongoid_id?
-        to_s.mongoid_id?
-      end
-      Mongoid.deprecate(self, :mongoid_id?)
-
       module ClassMethods
 
         # Turn the object from the ruby type we deal with to a Mongo friendly
diff --git a/lib/mongoid/extensions/true_class.rb b/lib/mongoid/extensions/true_class.rb
index 779586c743..029dcf31ae 100644
--- a/lib/mongoid/extensions/true_class.rb
+++ b/lib/mongoid/extensions/true_class.rb
@@ -5,17 +5,6 @@ module Mongoid
   module Extensions
     # Adds type-casting behavior to TrueClass
     module TrueClass
-      # Get the value of the object as a mongo friendly sort value.
-      #
-      # @example Get the object as sort criteria.
-      #   object.__sortable__
-      #
-      # @return [ Integer ] 1.
-      # @deprecated
-      def __sortable__
-        1
-      end
-      Mongoid.deprecate(self, :__sortable__)
 
       # Is the passed value a boolean?
       #