#!/usr/bin/perl

# http://perlmonks.org/?node_id=1207042

use strict;
use warnings;

my (%services, %bydate);

while(<DATA>)
  {
  /^(.{15}) (\S+) ([\w-]+)/ or next;
  $services{$3}++;
  $bydate{$1}{count}++;
  $bydate{$1}{$3}++;
  }

my @services = reverse sort keys %services;
print "Time Number_of_times_timestamp_appeared @services\n";
for my $key ( sort keys %bydate )
  {
  print "$key $bydate{$key}{count} @{[
    map $bydate{$key}{$_} // 0, @services ]}\n";
  }

__DATA__
Jan  7 04:13:02 centos1 rsyslogd: [origin software="rsyslogd" swVersio
+n="5.8.10" x-pid="1453" x-info="http://www.rsyslog.com"] rsyslogd was
+ HUPed
Jan  7 04:15:41 centos1 puppet-agent[5467]: Unable to fetch my node de
+finition, but the agent run will continue:
Jan  7 04:15:41 centos1 puppet-agent[5467]: getaddrinfo: Name or servi
+ce not known
Jan  7 13:16:01 centos1 puppet-agent[9305]: (/File[/var/lib/puppet/lib
+]) Could not evaluate: Could not retrieve file metadata for puppet://
+puppet/plugins: getaddrinfo: Name or service not known
Jan  7 13:16:02 centos1 dhclient[1624]: DHCPREQUEST on eth0 to 192.168
+.0.1 port 67 (xid=0xf27d6e5)
Jan  7 13:16:15 centos1 dhclient[1624]: DHCPREQUEST on eth0 to 192.168
+.0.1 port 67 (xid=0xf27d6e5)
[download]

Outputs:

Time Number_of_times_timestamp_appeared rsyslogd puppet-agent dhclient
Jan  7 04:13:02 1 1 0 0
Jan  7 04:15:41 2 0 2 0
Jan  7 13:16:01 1 0 1 0
Jan  7 13:16:02 1 0 0 1
Jan  7 13:16:15 1 0 0 1
[download]