pmdamailq is a Performance Metrics Domain Agent (PMDA) which extracts
performance metrics describing the state of the e-mail queues managed
by sendmail(1) and other mail transfer agents.
The mailq PMDA exports metrics that measure the total number of
entries in the mail queue, and the subtotals for entries that have
been queued for various time periods.
A brief description of the pmdamailq command line options follows:
-b The binlist argument specifies a list of delay thresholds used
to ``bin'' the entries in the queue into a a histogram based on
how long the entry has been in the mail queue. The default
thresholds are: 1 hour, 4 hours, 8 hours, 1 day, 3 days and 7
days. The entries in binlist are comma separated time
intervals, using the syntax described in PCPIntro(1) for an
update or reporting interval, e.g. the default list could be
specified using the value 1hr,4hrs,8hrs,1day,3days,7days.
Values in binlist are assumed to be in ascending order, and mail
items in the queue less than the first threshold are binned into
a special bin labeled ``recent''.
-d It is absolutely crucial that the performance metrics domain
number specified here is unique and consistent. That is, domain
should be different for every PMDA on the one host, and the same
domain number should be used for the same PMDA on all hosts.
-l Location of the log file. By default, a log file named
mailq.log is written in the current directory of pmcd(1) when
pmdamailq is started, i.e. $PCP_LOG_DIR/pmcd . If the log file
cannot be created or is not writable, output is written to the
standard error instead.
-r Use an extended regular expression to match file names in the
mail queue directory, rather than assuming all "df" prefixed
files in the directory are mail files (the "df" prefix is the
sendmail convention, but this convention is not followed by
other mail daemons). The regex pattern specified should conform
to the POSIX format described in regex(3), and it describes file
names that should be considered mail.
-U User account under which to run the agent. The default is the
unprivileged "pcp" account in current versions of PCP, but in
older versions the superuser account ("root") was used by
The optional queuedir argument defines the directory in which
pmdamailq expects to find the mail queue. The default is
If you want access to the names, help text and values for the mailq
performance metrics, do the following as root:
# cd $PCP_PMDAS_DIR/mailq
If you want to undo the installation, do the following as root:
# cd $PCP_PMDAS_DIR/mailq
pmdamailq is launched by pmcd(1) and should never be executed
directly. The Install and Remove scripts notify pmcd(1) when the
agent is installed or removed.
command line options used to launch pmdamailq$PCP_PMDAS_DIR/mailq/help
default help text file for the mailq metrics
installation script for the pmdamailq agent
undo installation script for the pmdamailq agent
default log file for error messages and other information
Environment variables with the prefix PCP_ are used to parameterize
the file and directory names used by PCP. On each installation, the
file /etc/pcp.conf contains the local values for these variables.
The $PCP_CONF variable may be used to specify an alternative
configuration file, as described in pcp.conf(5).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at ⟨http://www.pcp.io/⟩.
If you have a bug report for this manual page, send it to
firstname.lastname@example.org. This page was obtained from the project's upstream
Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
2020-07-14. (At that time, the date of the most recent commit that
was found in the repository was 2020-07-14.) If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
Performance Co-Pilot PCP PMDAMAILQ(1)