logging.xml

<?xml version="1.0" encoding="UTF-8"?>
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 <!ENTITY % BOOK_ENTITIES SYSTEM "Admin_Guide.ent">
]>
<section id="admin.config.logging">
	<title>System Logging and Debugging</title>

	<para>This section describes settings which can be used to
		troubleshoot MantisBT operations as well as assist during
		development.
	</para>

	<variablelist>
		<varlistentry>
			<term>$g_show_timer</term>
			<listitem>
				<para>Time page loads. The page execution timer shows at the bottom of each page.</para>
				<para>Default is OFF.</para>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_show_memory_usage</term>
			<listitem>
				<para>Show memory usage for each page load in the footer.</para>
				<para>Default is OFF.</para>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_debug_email</term>
			<listitem>
				<para>Used for debugging e-mail notifications.
					When it is '', the emails are sent normally.
					If set to an e-mail address, all messages are sent
					to it, with the original recipients (To, Cc, Bcc)
					included in the message body.
				</para>
				<para>Default is ''.</para>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_show_queries_count</term>
			<listitem>
				<para>Shows the total number/unique number of queries executed to
					serve the page.
				</para>
				<para>Default is OFF.</para>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_display_errors</term>
			<listitem>
				<para>Errors Display Method.
					Defines what <ulink url="https://www.php.net/errorfunc.constants">
						errors</ulink>
					are displayed and how.
					Available options are:
				</para>

				<variablelist>
					<varlistentry>
						<term>DISPLAY_ERROR_HALT</term>
						<listitem>
							<para>Stop and display the error message
								(including variables and backtrace if
								<emphasis>$g_show_detailed_errors</emphasis>
								is ON).
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>DISPLAY_ERROR_INLINE</term>
						<listitem>
							<para>Display a one line error and continue
								execution.
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>DISPLAY_ERROR_NONE</term>
						<listitem>
							<para>Suppress the error (no display).
								This is the default behavior for unspecified
								<ulink url="https://www.php.net/errorfunc.constants">
									errors constants</ulink>.
							</para>
						</listitem>
					</varlistentry>
				</variablelist>

				<para>
					The default settings, recommended for use in production will only
					display and exit on errors and suppress warninga and notices.
				</para>
				<para>Recommended <filename>config_inc.php</filename>
					settings for developers:
<programlisting>
$g_display_errors = array(
	E_USER_WARNING =&gt; DISPLAY_ERROR_HALT,
	E_WARNING      =&gt; DISPLAY_ERROR_HALT,
	E_ALL          =&gt; DISPLAY_ERROR_INLINE,
);
</programlisting>
				</para>
				<note>
					<para>The system automatically sets
						<emphasis>$g_display_errors</emphasis>
						to the above recommended development values when
						the server's name is <emphasis>localhost</emphasis>.
					</para>
				</note>
				<para>Less intrusive settings, recommended for testing purposes:
<programlisting>
$g_display_errors = array(
	E_USER_WARNING =&gt; DISPLAY_ERROR_INLINE,
	E_WARNING      =&gt; DISPLAY_ERROR_INLINE,
);
</programlisting>
				</para>
				<warning><para><literal>E_USER_ERROR</literal>
					should <emphasis>always</emphasis> be set to
					<literal>DISPLAY_ERROR_HALT</literal>.
					Using any other value will cause program execution
					to continue despite the error, which may lead to data
					integrity issues and/or cause MantisBT to function
					incorrectly.
				</para></warning>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_show_detailed_errors</term>
			<listitem>
				<para>Shows a list of variables and their values
					whenever an error is triggered.
					Only applies to error types configured to
					<literal>DISPLAY_ERROR_HALT</literal>
					in <emphasis>$g_display_errors</emphasis>.
				</para>
				<para>Default is OFF.</para>
				<warning><para>Setting this to ON is a potential security
					hazard, as it can expose sensitive information.
					Only enable this setting for debugging purposes
					when you really need it.
				</para></warning>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_stop_on_errors</term>
			<listitem>
				<para>Debug messages.
					If this option is turned OFF, page redirects will
					function if a non-fatal error occurs.
					For debugging purposes, you can set this to ON so
					that any non-fatal error will prevent page redirection,
					allowing you to see the errors.
				</para>
				<para>Default is OFF.</para>
				<note><para>This should only be turned on when debugging.
				</para></note>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_log_level</term>
			<listitem>
				<para>The system logging interface is used to extract
					detailed debugging information for the MantisBT system.
					It can also serve as an audit trail for users' actions.
				</para>
				<para>This controls the type of logging information
					recorded.
					Refer to <emphasis>$g_log_destination</emphasis>
					for details on where to save the logs.
				</para>
				<para>The available log channels are:
				</para>

				<variablelist>
					<varlistentry>
						<term>LOG_NONE</term>
						<listitem>
							<para>Disable logging</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_AJAX</term>
						<listitem>
							<para>logs AJAX events</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_DATABASE</term>
						<listitem>
							<para>logs database events and executed
								SQL queries
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_EMAIL</term>
						<listitem>
							<para>logs issue id, message type and
								recipients for all emails sent
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_EMAIL_VERBOSE</term>
						<listitem>
							<para>
								Enables extra logging for troubleshooting internals
								of email queuing and sending.
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_EMAIL_RECIPIENT</term>
						<listitem>
							<para>logs the details of email recipient
								determination.
								Each user id is listed as well as why
								they are added, or deleted from the
								recipient list
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_FILTERING</term>
						<listitem>
							<para>logs filter operations</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_LDAP</term>
						<listitem>
							<para>logs the details of LDAP operations
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_WEBSERVICE</term>
						<listitem>
							<para>logs the details of Web Services operations (e.g. SOAP API)
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_PLUGIN</term>
						<listitem>
							<para>Enables logging from plugins.
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>LOG_ALL</term>
						<listitem>
							<para>combines all of the above log levels
							</para>
						</listitem>
					</varlistentry>
				</variablelist>
				<para>Default is LOG_NONE.</para>
				<note><para>Multiple log channels can be combined using
					<ulink url="https://www.php.net/language.operators.bitwise">
						PHP bitwise operators
					</ulink>, e.g.
<programlisting>$g_log_level = LOG_EMAIL | LOG_EMAIL_RECIPIENT;</programlisting>
or
<programlisting>$g_log_level = LOG_ALL &amp; ~LOG_DATABASE;</programlisting>
				</para></note>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_log_destination</term>
			<listitem>
				<para>Specifies where the log data goes.
					The following five options are available:
				</para>

				<variablelist>
					<varlistentry>
						<term>''</term>
						<listitem>
							<para>The empty string means
								<ulink url="https://www.php.net/error_log">
									default PHP error log settings
								</ulink>
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>'none'</term>
						<listitem>
							<para>
								Don't output the logs, but would still trigger EVENT_LOG
								plugin event.
							</para>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>'file'</term>
						<listitem>
							<para>Log to a specific file, specified
								as an absolute path, e.g.
								<literal>'file:/var/log/mantis.log'</literal>
								(Unix) or
								<literal>'file:c:/temp/mantisbt.log'</literal>
								(Windows)
							</para>
							<note><para>This file must be writable by the
								web server running MantisBT.
							</para></note>
						</listitem>
					</varlistentry>
					<varlistentry>
						<term>'page'</term>
						<listitem>
							<para>Display log output at bottom of the page.
								See also <emphasis>$g_show_log_threshold</emphasis>
								to restrict who can see log data.
							</para>
						</listitem>
					</varlistentry>
				</variablelist>

				<para>Default is '' (empty string).
				</para>
			</listitem>
		</varlistentry>

		<varlistentry>
			<term>$g_show_log_threshold</term>
			<listitem>
				<para>Indicates the access level required for a user
					to see the log output (if
					<emphasis>$g_log_destination</emphasis> is 'page').
				</para>
				<para>Default is ADMINISTRATOR.</para>
				<note><para>This threshold is compared against the user's
					<emphasis>global access level</emphasis> rather than
					the one from the currently active project.
				</para></note>
			</listitem>
		</varlistentry>

	</variablelist>
</section>