DOCSP-46696: Logging page (#154)

(cherry picked from commit 0876f2f)

Author: mcmorisi

source/index.txt

@@ -22,6 +22,7 @@ MongoDB {+driver-short+} Documentation
    Aggregation </aggregation>
    Security </security>
    Data Formats </data-formats>
+   Logging </logging>
    Third-Party Tools </tools>
    FAQ </faq>
    Troubleshooting </troubleshooting>

source/logging.txt

@@ -0,0 +1,66 @@
+.. _pymongo-logging:
+
+=======
+Logging
+=======
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 2
+   :class: singlecol
+
+.. facet::
+   :name: genre
+   :values: reference
+
+.. meta::
+   :keywords: debugging, printing
+
+Overview
+--------
+
+In this guide, you can learn how to configure logging options for different
+{+driver-short+} components.
+
+{+driver-short+} supports {+language+}'s native logging library. You can configure the logging
+verbosity for the following components:
+
+- ``pymongo.command``, which logs command operations
+- ``pymongo.connection``, which logs connection management operations
+- ``pymongo.serverSelection``, which logs server selection operations
+
+In addition to configuring these options individually, you can configure the global
+logging level by setting the log level on ``pymongo``. To learn more about the native
+logging library, see the `Python logging library documentation <https://docs.python.org/3/howto/logging.html>`__.
+
+Examples
+--------
+
+The follwing example sets the global logging level to ``INFO``:
+
+.. code-block:: python
+
+   import logging
+   logging.getLogger("pymongo").setLevel(logging.INFO)
+
+The following example sets the log level on the ``pymongo.command`` component to
+``DEBUG``:
+
+.. code-block:: python
+
+   import logging
+   logging.getLogger("pymongo.command").setLevel(logging.DEBUG)
+
+Configuring Truncation
+----------------------
+
+If you enable logging for the ``pymongo.command`` component, the resulting logs will
+be truncated after 1000 bytes by default. You can configure this truncation limit
+by setting the ``MONGODB_LOG_MAX_DOCUMENT_LENGTH`` environment variable to your
+desired length, as shown in the following example:
+
+.. code-block:: python
+
+   import os
+   os.environ["MONGODB_LOG_MAX_DOCUMENT_LENGTH"] = "2000"