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NAME

Log::Log4perl::Appender::RRDs - Log to a RRDtool Archive

=head1 SYNOPSIS

    use Log::Log4perl qw(get_logger);
    use RRDs;

    my $DB = "myrrddb.dat";

    RRDs::create(
      $DB, "--step=1",
      "DS:myvalue:GAUGE:2:U:U",
      "RRA:MAX:0.5:1:120");

    print time(), "\n";

    Log::Log4perl->init(\qq{
      log4perl.category = INFO, RRDapp
      log4perl.appender.RRDapp = Log::Log4perl::Appender::RRDs
      log4perl.appender.RRDapp.dbname = $DB
      log4perl.appender.RRDapp.layout = Log::Log4perl::Layout::PatternLayout
      log4perl.appender.RRDapp.layout.ConversionPattern = N:%m
    });

    my $logger = get_logger();

    for(10, 15, 20, 25) {
        $logger->info($_);
        sleep 1;
    }

=head1 DESCRIPTION

Log::Log4perl::Appender::RRDs appenders facilitate writing data to RRDtool round-robin archives via Log4perl. For documentation on RRD and its Perl interface RRDs (which comes with the distribution), check out http://rrdtool.org.

Messages sent to Log4perl's RRDs appender are expected to be numerical values (ints or floats), which then are used to run a rrdtool update command on an existing round-robin database. The name of this database needs to be set in the appender's dbname configuration parameter.

If there's more parameters you wish to pass to the update method, use the rrdupd_params configuration parameter:

    log4perl.appender.RRDapp.rrdupd_params = --template=in:out

To read out the round robin database later on, use rrdtool fetch or rrdtool graph for graphic displays.

AUTHOR

Mike Schilli <log4perl@perlmeister.com>, 2004