Adding resource definition for postgres custom metrics (for validation)

manifests/integrations/postgres.pp

@@ -44,13 +44,12 @@
   $password,
   $tags = [],
   $tables = [],
-  $custom_metrics = [],
+  $custom_metrics = {},
 ) inherits datadog_agent::params {
   include datadog_agent
 
   validate_array($tags)
   validate_array($tables)
-  validate_array($custom_metrics)
 
   file { "${datadog_agent::params::conf_dir}/postgres.yaml":
     ensure  => file,
@@ -61,4 +60,6 @@
     require => Package[$datadog_agent::params::package_name],
     notify  => Service[$datadog_agent::params::service_name],
   }
+
+  create_resources("datadog_agent::integrations::postgres_custom_metric", $custom_metrics)
 }

manifests/integrations/postgres_custom_metric.pp

@@ -0,0 +1,27 @@
+##
+# The postgres_custom_metric defines a custom sql metric.
+# https://help.datadoghq.com/hc/en-us/articles/208385813-Postgres-custom-metric-collection-explained
+#
+# $query:
+#   The custom metric SQL query. It must contain a '%s' for defining the metrics.
+#
+# $metrics:
+#   a hash of column name to metric definition. a metric definition is an array
+#   consisting of two columns -- the datadog metric name and the metric type.
+#
+# $relation:
+#   ?
+#
+# $descriptor:
+#   an array that maps an sql column's to a tag. Each descriptor consists of two
+#   fields -- column name, and datadog tag.
+define datadog_agent::integrations::postgres_custom_metric(
+  $query,
+  $metrics,
+  $relation = false,
+  $descriptors = [],
+) {
+  validate_re($query, '^.*%s.*$')
+  validate_hash($metrics)
+  validate_array($descriptors)
+}