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.\" ========================================================================
.\"
.IX Title "Net::Prometheus::ProcessCollector::linux 3pm"
.TH Net::Prometheus::ProcessCollector::linux 3pm "2020-11-09" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
"Net::Prometheus::ProcessCollector::linux" \- Process Collector for linux OS
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&   use Net::Prometheus;
\&   use Net::Prometheus::ProcessCollector::linux;
\&
\&   my $prometheus = Net::Prometheus\->new;
\&
\&   $prometheus\->register( Net::Prometheus::ProcessCollector::linux\->new );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This class provides a Net::Prometheus collector instance to provide
process-wide metrics for a process running on the \fIlinux\fR operating system.
.PP
At collection time, if the requested process does not exist, no metrics are
returned.
.SS "Other Process Collection"
.IX Subsection "Other Process Collection"
The \f(CW\*(C`pid\*(C'\fR argument allows the collector to collect from processes other than
the one actually running the code.
.PP
Note also that scraping processes owned by other users may not be possible for
non-root users. In particular, most systems do not let non-root users see the
\&\*(L"proc/self/fd\*(R" directory of processes they don't own. In this case, the
\&\f(CW\*(C`process_open_fds\*(C'\fR metric will not be returned.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.SS "new"
.IX Subsection "new"
.Vb 1
\&   $collector = Net::Prometheus::ProcessCollector::linux\->new( %args )
.Ve
.PP
As well as the default arguments supported by
Net::Prometheus::ProcessCollector, the following extra named arguments are
recognised:
.IP "pid => \s-1STR\s0" 4
.IX Item "pid => STR"
The numerical \s-1PID\s0 to collect information about; defaults to the string
\&\f(CW"self"\fR allowing the exporter to collect information about itself, even over
fork calls.
.Sp
If the collector is collecting from \f(CW"self"\fR or from a numerical \s-1PID\s0 that
matches its own \s-1PID,\s0 then it will subtract 1 from the count of open file
handles, to account for the \f(CW\*(C`readdir()\*(C'\fR handle being used to collect that
count. If it is collecting a different process, it will not.
.SH "AUTHOR"
.IX Header "AUTHOR"
Paul Evans <leonerd@leonerd.org.uk>