(plugin) cloud::prometheus::restapi - adding discovery mode for Prometheus targets (#3781)

* adding prom discovery mode for targets

* adding details to help in disco mode

* indent

* remove extra blank line

* modif regex for ip addr + apply suggestion

centreon-plugins/cloud/prometheus/restapi/mode/discovery.pm

@@ -0,0 +1,109 @@
+#
+# Copyright 2022 Centreon (http://www.centreon.com/)
+#
+# Centreon is a full-fledged industry-strength solution that meets
+# the needs in IT infrastructure and application monitoring for
+# service performance.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+package cloud::prometheus::restapi::mode::discovery;
+
+use base qw(centreon::plugins::mode);
+
+use strict;
+use warnings;
+
+sub new {
+    my ($class, %options) = @_;
+    my $self = $class->SUPER::new(package => __PACKAGE__, %options);
+    bless $self, $class;
+
+    $options{options}->add_options(arguments => {
+        "prettify" => { name => 'prettify' },
+    });
+
+    return $self;
+}
+
+sub check_options {
+    my ($self, %options) = @_;
+    $self->SUPER::init(%options);
+}
+
+sub manage_selection {
+    my ($self, %options) = @_;
+
+    my @disco_data;
+    my $disco_stats;
+
+    $disco_stats->{start_time} = time();
+
+    my $disco_results = $options{custom}->get_endpoint(url_path => '/targets');
+
+    foreach my $target_information (@{$disco_results->{activeTargets}}) {
+        my %target;
+        $target{instance} = $target_information->{labels}->{instance};
+        $target{filter_instance} = "instance," . $target_information->{labels}->{instance};
+        $target_information->{labels}->{instance} =~ s/(.*):\d+$//;
+        $target{instance_address} = $1;
+        $target{job} = $target_information->{labels}->{job};
+        $target{group} = $target_information->{labels}->{group};
+        push @disco_data, \%target;
+    }
+
+    $disco_stats->{end_time} = time();
+    $disco_stats->{duration} = $disco_stats->{end_time} - $disco_stats->{start_time};
+    $disco_stats->{discovered_items} = @disco_data;
+    $disco_stats->{results} = \@disco_data;
+
+    return $disco_stats;
+
+}
+
+sub run {
+    my ($self, %options) = @_;
+
+    my $encoded_data;
+
+    eval {
+        if (defined($self->{option_results}->{prettify})) {
+            $encoded_data = JSON::XS->new->utf8->pretty->encode($self->manage_selection(%options));
+        } else {
+            $encoded_data = JSON::XS->new->utf8->encode($self->manage_selection(%options));
+        }
+    };
+    if ($@) {
+        $encoded_data = '{"code":"encode_error","message":"Cannot encode discovered data into JSON format"}';
+    }
+
+    $self->{output}->output_add(short_msg => $encoded_data);
+    $self->{output}->display(nolabel => 1, force_ignore_perfdata => 1);
+    $self->{output}->exit();
+    
+}
+
+1;
+
+__END__
+
+=head1 MODE
+
+Prometheus targets discovery.
+
+=over 8
+
+=back
+
+=cut

centreon-plugins/cloud/prometheus/restapi/plugin.pm

@@ -31,6 +31,7 @@ sub new {
 
     $self->{version} = '0.1';
     %{$self->{modes}} = (
+        'discovery'        => 'cloud::prometheus::restapi::mode::discovery',
         'expression'       => 'cloud::prometheus::restapi::mode::expression',
         'target-status'    => 'cloud::prometheus::restapi::mode::targetstatus',
     );