adding environments metric

lib/dropsonde/metrics/environments.rb

@@ -0,0 +1,50 @@
+class Dropsonde::Metrics::Environments
+  def self.initialize_environments
+    # Require any libraries needed here -- no need to load puppet or puppetdb;
+    # they're already loaded. This hook is named after the class name.
+    # All plugins are initialized at startup before any metrics are generated.
+  end
+
+  def self.description
+    # This is a Ruby squiggle heredoc; just a multi-line string with indentation removed
+    <<~EOF
+      This group of metrics gathers information about environments.
+    EOF
+  end
+
+  def self.schema
+    # return an array of hashes of a partial schema to be merged into the complete schema
+    [
+      {
+        "description": "The number of environments",
+        "mode": "NULLABLE",
+        "name": "environment_count",
+        "type": "INTEGER"
+      }
+    ]
+  end
+
+  def self.setup
+    # run just before generating this metric
+  end
+
+  def self.run
+    # return an array of hashes representing the data to be merged into the combined checkin
+    [
+      :environment_count => Puppet.lookup(:environments).list.count,
+    ]
+  end
+
+  def self.example
+    # this method is used to generate a table filled with randomized data to
+    # make it easier to write data aggregation queries without access to the
+    # actual private data that users have submitted.
+    [
+      :environment_count => rand(1..100),
+    ]
+  end
+
+  def self.cleanup
+    # run just after generating this metric
+  end
+end