CPP: Tag defect filter queries.

cpp/ql/src/external/examples/filters/EditDefectMessage.ql

@@ -4,6 +4,7 @@
  *              generated by the query that it is filtering. In this
  *              example the string `Filtered query result: ` is
  *              prepended to the message.
+ * @tags filter
  */
 import cpp
 import external.DefectFilter

cpp/ql/src/external/examples/filters/ExcludeGeneratedCode.ql

@@ -4,6 +4,7 @@
  *              they meet certain criteria. In this example, results are
  *              only returned if they do not come from a file which
  *              contains 'generated' anywhere in its path.
+ * @tags filter
  */
 import cpp
 import external.DefectFilter

cpp/ql/src/external/tests/DefectFilter.ql

@@ -1,6 +1,7 @@
 /**
  * @name Defect filter
  * @description Only include results in large files (200) lines of code, and change the message.
+ * @tags filter
  */
 import cpp
 import external.DefectFilter

cpp/ql/src/filters/FilterAutogenerated.ql

@@ -4,6 +4,7 @@
  *              located in files that are maintained manually.
  * @kind problem
  * @id cpp/autogenerated-filter
+ * @tags filter
  */
  
 import cpp

cpp/ql/src/filters/FromSource.ql

@@ -5,6 +5,7 @@
  *              located in files for which we have source code.
  * @kind problem
  * @id cpp/from-source-filter
+ * @tags filter
  */
 
 import cpp

cpp/ql/src/filters/Macros.ql

@@ -5,6 +5,7 @@
  *              the result's location.
  * @kind problem
  * @id cpp/macros-filter
+ * @tags filter
  */
 import cpp
 import external.DefectFilter

cpp/ql/src/filters/RecentDefects.ql

@@ -6,6 +6,7 @@
  *              before the date of the snapshot.
  * @kind problem
  * @id cpp/recent-defects-filter
+ * @tags filter
  * @deprecated
  */
 import cpp