Merge pull request github#3449 from jf205/sd-38

CodeQL docs: remove information about metric queries

Author: jf205

docs/language/learn-ql/writing-queries/introduction-to-queries.rst

@@ -10,19 +10,9 @@ CodeQL includes queries to find the most relevant and interesting problems for e
 
 - **Alert queries**: queries that highlight issues in specific locations in your code.
 - **Path queries**: queries that describe the flow of information between a source and a sink in your code.
-- **Metric queries**: queries that compute statistics for your code.
 
 You can add custom queries to `custom query packs <https://lgtm.com/help/lgtm/about-queries#what-are-query-packs>`__ to analyze your projects in `LGTM <https://lgtm.com>`__, use them to analyze a database with the `CodeQL CLI <https://help.semmle.com/codeql/codeql-cli.html>`__, or you can contribute to the standard CodeQL queries in our `open source repository on GitHub <https://github.com/github/codeql>`__.
 
-.. pull-quote::
-
-    Note
-
-    Only the results generated by alert and path queries are displayed on LGTM.     
-    You can display the results generated by metric queries by running them against your project in the `query console on LGTM <https://lgtm.com/query>`__ or with the CodeQL `extension for VS Code <https://help.semmle.com/codeql/codeql-for-vscode.html>`__. 
-    You can explore the paths generated by path queries `directly in LGTM <https://lgtm.com/help/lgtm/exploring-data-flow-paths>`__ and in the `Results view <https://help.semmle.com/codeql/codeql-for-vscode/procedures/exploring-paths.html>`__ in VS Code.
-
-
 This topic is a basic introduction to query files. You can find more information on writing queries for specific programming languages `here <https://help.semmle.com/QL/learn-ql/>`__, and detailed technical information about QL in the `QL language reference <https://help.semmle.com/QL/ql-handbook/index.html>`__.
 For more information on how to format your code when contributing queries to the GitHub repository, see the `CodeQL style guide <https://github.com/github/codeql/blob/master/docs/ql-style-guide.md>`__.
 
@@ -45,7 +35,7 @@ Basic query structure
     where /* ... logical formula ... */
     select /* ... expressions ... */
 
-The following sections describe the information that is typically included in a query file for alerts and metrics. Path queries are discussed in more detail in :doc:`Creating path queries <path-queries>`. 
+The following sections describe the information that is typically included in a query file for alerts. Path queries are discussed in more detail in :doc:`Creating path queries <path-queries>`. 
 
 Query metadata
 ==============
@@ -65,7 +55,6 @@ Query metadata is used to identify your custom queries when they are added to th
 
     - Alert query metadata must contain ``@kind problem``.
     - Path query metadata must contain ``@kind path-problem``.
-    - Metric query metadata must contain ``@kind metric``.
 
     When you define the ``@kind`` property of a custom query you must also ensure that the rest of your query has the correct structure in order to be valid, as described below.
 
@@ -121,13 +110,6 @@ You can modify the alert message defined in the final column of the ``select`` s
 
 Select clauses for path queries (``@kind path-problem``) are crafted to display both an alert and the source and sink of an associated path graph. For more information, see :doc:`Creating path queries <path-queries>`.
 
-Select clauses for metric queries (``@kind metric``) consist of two 'columns', with the following structure::
-
-    select element, metric
-
-- ``element``: a code element that is identified by the query, which defines where the alert is displayed.
-- ``metric``: the result of the metric that the query computes.
-
 Viewing the standard CodeQL queries
 ***********************************