man: document LogFieldMax= and LogExtraFields=

1 files changed, 35 insertions, 0 deletions

diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 4a97b1d203..d043555860 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -744,6 +744,41 @@
       </varlistentry>
 
       <varlistentry>
+        <term><varname>LogLevelMax=</varname></term>
+        <listitem><para>Configures filtering by log level of log messages generated by this unit. Takes a
+        <command>syslog</command> log level, one of <option>emerg</option> (lowest log level, only highest priority
+        messages), <option>alert</option>, <option>crit</option>, <option>err</option>, <option>warning</option>,
+        <option>notice</option>, <option>info</option>, <option>debug</option> (highest log level, also lowest priority
+        messages). See <citerefentry
+        project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry> for
+        details. By default no filtering is applied (i.e. the default maximum log level is <option>debug</option>). Use
+        this option to configure the logging system to drop log messages of a specific service above the specified
+        level. For example, set <varname>LogLevelMax=</varname><option>info</option> in order to turn off debug logging
+        of a particularly chatty unit. Note that the the configured level is applied to any log messages written by any
+        of the processes belonging to this unit, sent via any supported logging protocol. The filtering is applied
+        early in the logging pipeline, before any kind of further processing is done. Moreover, messages which pass
+        through this filter successfully might still be dropped by filters applied at a later stage in the logging
+        subsystem. For example, <varname>MaxLevelStore=</varname> configured in
+        <citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> might
+        prohibit messages of higher log levels to be stored on disk, even though the per-unit
+        <varname>LogLevelMax=</varname> permitted it to be processed.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><varname>LogExtraFields=</varname></term>
+        <listitem><para>Configures additional log metadata fields to include in all log records generated by processes
+        associated with this unit. This setting takes one or more journal field assignments in the format
+        <literal>FIELD=VALUE</literal> separated by whitespace. See
+        <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry> for
+        details on the journal field concept. Even though the underlying journal implementation permits binary field
+        values, this setting accepts only valid UTF-8 values. To include space characters in a journal field value,
+        enclose the assignment in double quotes ("). The usual specifiers are expanded in all assignments (see
+        below). Note that this setting is not only useful for attaching additional metadata to log records of a unit,
+        but given that all fields and values are indexed may also be used to implement cross-unit log record
+        matching. Assign an empty string to reset the list.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
         <term><varname>TimerSlackNSec=</varname></term>
         <listitem><para>Sets the timer slack in nanoseconds for the
         executed processes. The timer slack controls the accuracy of