2 # Plugin to monitor pg_stat_*_tables (user by default)
4 # Copyright Dalibo <cedric.villemain@dalibo.com> 2007
5 # Based on a plugin (postgres_block_read_) from Björn Ruberg <bjorn@linpro.no>
7 # Licenced under GPL v2.
11 # Symlink into /etc/munin/plugins/ and add the monitored
12 # database to the filename. e.g.:
14 # ln -s /usr/share/munin/plugins/pg__stat_tables \
15 # /etc/munin/plugins/pg_<databasename>_stat_tables
16 # This should, however, be given through autoconf and suggest.
18 # If required, give username, password and/or Postgresql server
19 # host through environment variables.
21 # You must also activate Postgresql statistics. See
22 # http://www.postgresql.org/docs/8.1/interactive/monitoring-stats.html
23 # for how to enable this. Specifically, the following lines must
24 # exist in your postgresql.conf:
26 # stats_start_collector = true
27 # stats_block_level = true
36 # dbhost - Which database server to use. Defaults to
38 # dbname - Which database to use. Defaults to template1
39 # dbuser - A Postgresql user account with read permission to
40 # the given database. Defaults to
41 # 'postgres'. Anyway, Munin must be told which user
42 # this plugin should be run as.
43 # dbpass - The corresponding password, if
44 # applicable. Default to undef. Remember that
45 # pg_hba.conf must be configured accordingly.
49 #%# capabilities=autoconf
53 use vars qw ( $debug $configure );
54 use constant _PGMINI => 70400;
56 my $dbhost = $ENV{'dbhost'} || '';
57 my $dbname = $ENV{'dbname'} || 'template1';
58 my $dbuser = $ENV{'dbuser'} || 'postgres';
59 my $dbport = $ENV{'dbport'} || '5432';
60 my $dbpass = $ENV{'dbpass'} || '';
61 my $statscope = $ENV{'statscope'} || 'user';
63 my $dsn = "DBI:Pg:dbname=$dbname";
64 $dsn .=";host=$dbhost;port=$dbport" if $dbhost;
65 my $pg_server_version;
67 if (exists $ARGV[0]) {
68 if ($ARGV[0] eq 'autoconf') {
70 if (! eval "require DBD::Pg;") {
71 print "no (DBD::Pg not found)";
74 my $dbh = DBI->connect ($dsn,
79 $pg_server_version = $dbh->{'pg_server_version'};
80 if ($pg_server_version < (_PGMINI)) {
81 $pg_server_version =~ /(\d)(\d){2,2}(\d){2,2}/;
82 print "PostgreSQL Server version " . (_PGMINI) . " or above is needed. Current is $1.$2.$3 \n";
88 print "no Unable to access Database $dbname on host $dbhost as user $dbuser.\nError returned was: ". $DBI::errstr;
91 } elsif ($ARGV[0] eq 'debug') {
94 } elsif ($ARGV[0] eq 'config') {
100 print "# $dsn\n" if $debug;
101 my $dbh = DBI->connect ($dsn,
106 die ("no Unable to access Database $dbname on host $dbhost as user $dbuser.\nError returned was: ". $DBI::errstr."\n") unless($dbh);
107 $pg_server_version = $dbh->{'pg_server_version'};
110 print "graph_title Total Nominatim response time\n";
111 print "graph_vlabel Time to response\n";
112 print "graph_category Nominatim \n";
113 print "graph_period minute\n";
114 print "graph_args --base 1000\n";
116 print "avg.label Average time to response\n";
117 print "avg.draw LINE\n";
118 print "avg.type GAUGE\n";
120 print "avg.info Moving 5 minute average time to perform search\n";
121 print "avg.label Average time to response\n";
123 print "min.label Fastest time to response\n";
124 print "min.draw LINE\n";
125 print "min.type GAUGE\n";
127 print "min.info Fastest query in last 5 minutes\n";
129 print "max.label Slowest time to response\n";
130 print "max.draw LINE\n";
131 print "max.type GAUGE\n";
133 print "max.info Slowest query in last 5 minutes\n";
137 my $sql = "select TO_CHAR(avg(endtime-starttime),'SS.MS'),TO_CHAR(min(endtime-starttime),'SS.MS'),TO_CHAR(max(endtime-starttime),'SS.MS') from query_log where starttime > 'now'::timestamp - '5 minutes'::interval";
138 print "# $sql\n" if $debug;
139 my $sth = $dbh->prepare($sql);
141 printf ("# Rows: %d\n", $sth->rows) if $debug;
142 if ($sth->rows > 0) {
143 my ($avg, $min, $max) = $sth->fetchrow_array();
144 print "avg.value $avg\n";
145 print "min.value $min\n";
146 print "max.value $max\n";