DOCS-7761: Remove keyUpdates, fastmod, idhack and moved metrics

source/reference/command/serverStatus.txt

@@ -1604,8 +1604,6 @@ metrics
             "wtimeouts" : NumberLong(<num>)
       },
       "operation" : {
-            "fastmod" : NumberLong(<num>),
-            "idhack" : NumberLong(<num>),
             "scanAndOrder" : NumberLong(<num>),
             "writeConflicts" : NumberLong(<num>)
       },
@@ -1788,6 +1786,8 @@ metrics
 
 .. serverstatus:: metrics.operation.fastmod
 
+   *Removed in 3.4.*
+
    If using MMAPv1 storage engine, the number of :doc:`update
    </tutorial/update-documents>` operations that neither cause documents to
    grow nor require updates to the index. For example, this counter
@@ -1796,6 +1796,8 @@ metrics
 
 .. serverstatus:: metrics.operation.idhack
 
+   *Removed in 3.4.*
+
    The number of queries that contain the ``_id`` field. For these
    queries, MongoDB will use default index on the ``_id`` field and
    skip all query plan analysis.

source/reference/database-profiler.txt

@@ -252,6 +252,8 @@ operation.
 
 .. data:: system.profile.moved
 
+   *Removed in 3.4.*
+
    .. versionchanged:: 3.0.0
 
       Only appears when using the MMAPv1 storage engine.
@@ -339,7 +341,12 @@ operation.
 
 .. data:: system.profile.keysDeleted
 
-   The number of index keys deleted for a given write operation.
+   *Removed in 3.4.*
+
+   The number of :doc:`index </indexes>` keys the update changed in
+   the operation. Changing an index key carries a small performance
+   cost because the database must remove the old key and inserts a new
+   key into the B-tree index.
 
 .. data:: system.profile.writeConflicts
 

source/reference/mongodb-extended-json.txt

@@ -41,6 +41,8 @@ recognition of the type information.
 
 - ``--query`` option of various MongoDB tools
 
+- :products:`MongoDB Compass </compass>`
+
 Other JSON parsers, including :program:`mongo` shell and
 :method:`db.eval()`, can parse strict mode representations as key/value
 pairs, but *without* recognition of the type information.