Merge pull request kairosdb#262 from paladini/update_log_documentation

Add "Logging" section to the documentation.

src/docs/Logging.rst

@@ -0,0 +1,13 @@
+============
+Logging
+============
+
+KairosDB create it's log files in ``/opt/kairosdb/log/``. It works in a daily basis, so every day a new log is created and named as **kairosdb.log**; when the next day comes *kairosdb.log* is compressed and renamed to *kairosdb.<YYYY-MM-DD>.log*, where <YYYY-MM-DD> is the date when this specific log file was created. 
+
+Starting from KairosDB 1.1.2, a more robust logging system will be used. From this version, KairosDB will compress logs everyday in order to minimize the space used for log files. Also, every time a log file reaches 100mb, it will be compressed and a new one will be generated for the same day (until the end of the day, when a new log file will be generated too).
+
+	**Note:** KairosDB uses the well-know Logback framework to manage it's log files. If you have questions about Logback, please refer to their forums.
+
+If you want to change these logging settings, please take a look at ``/opt/kairosdb/conf/logging/logback.xml`` and at `Logback documentation`_.
+
+.. _Logback documentation: http://logback.qos.ch/manual/configuration.html

src/docs/index.rst

@@ -16,6 +16,7 @@ Contents:
    ImportExport
    WebUI
    Configuration
+   Logging
    Statistics
    KairosClient
    CassandraSchema