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contrib-munin/plugins/other/apache_average_time_last_n_requests

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2008-06-24 16:32:16 +02:00
#!/usr/bin/perl -w
# $Id$
# Author: Nicolas Mendoza <nicolasm@opera.com> - 2008-06-18
#
# Monitors the average time requests matching a custom regexp takes
# For instance monitor time execution of files in http://example.com/foo/bar,
# requests from google, images etc.
#
# Simply add an entry in the 'type' hashref and modify the description fields
# for munin, and make the 'matches' member contain a subref that returns
# true if a request matches, parameters are a list containing the request
# split on spaces.
#
# NOTE: You need to add a field in your Apache logs showing time executed.
# This is normally done using the %T (seconds) or %D (microseconds)
# For instance:
# LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\" %T %v"
# Check http://httpd.apache.org/docs/2.2/mod/mod_log_config.html#formats for more info
use strict;
my $LAST_N_REQUESTS = 100000; # calculate based on this amount of requests
my $ACCESS_LOG_PATTERN = '/var/log/apache2/access.log.*'; # log pattern, if many it will take the last one.
my $TIME_FIELD_INDEX = -2; # second last field
my $config =<< "CONFIG"
graph_title Apache average seconds last $LAST_N_REQUESTS requests
graph_args --base 1000
graph_scale no
graph_vlabel Average request time
graph_category Apache
graph_info This graph shows average request times for the last $LAST_N_REQUESTS requests
CONFIG
;
my $types = {
# any kind of request
total => {
munin_fields => {
label => 'All requests',
draw => 'LINE2',
info => 'Average seconds per any request',
},
sum => 0,
lines => 0,
matches => sub {
return 1;
},
},
# image requests
images => {
munin_fields => {
label => 'Image requests',
draw => 'LINE2',
info => 'Average seconds per image request',
},
sum => 0,
lines => 0,
matches => sub {
my ($fields) = @_;
my $script;
($script = $fields->[6]) =~ s/\?.*\z //mx;
return $script =~ m{ \.(png|jpe?g|jpg|gif|tiff|ilbm|tga) \z }mx;
},
},
};
if (defined(@ARGV) && ($ARGV[0] eq 'config')) {
print $config;
foreach my $type (keys %{$types}) {
foreach my $key (keys %{$types->{$type}->{'munin_fields'}}) {
printf "%s.%s %s\n", ($type, $key, $types->{$type}->{'munin_fields'}->{$key});
}
}
exit(0);
}
my $config_file = `ls -1 $ACCESS_LOG_PATTERN | tail -n 1`;
chomp $config_file;
my @lines = `tail -n $LAST_N_REQUESTS "$config_file"`;
foreach my $line (@lines) {
foreach my $type (keys %{$types}) {
my @fields = split /\s+/, $line;
if ($types->{$type}->{'matches'}(\@fields)) {
$types->{$type}->{'sum'} += $fields[$TIME_FIELD_INDEX];
$types->{$type}->{'lines'}++;
}
}
}
foreach my $type (keys %{$types}) {
my $value = $types->{$type}->{'lines'} ? $types->{$type}->{'sum'} / $types->{$type}->{'lines'} : 'U';
printf "%s.value %s\n", ($type, $value);
}