Document missing Prometheus configuration options (#165)

config-example.yml

@@ -21,6 +21,21 @@ rodhaj:
   # Note: Set this to false or remove this entry when running Rodhaj in production
   dev_mode: False
 
+  # Prometheus exporter for Rodhaj. The following keys are used in order to control
+  # the behavior of the Prometheus exporter
+  prometheus:
+
+    # Whether the Prometheus exporter is enabled or not
+    enabled: False
+
+    # The host that the Prometheus exporter will bind to. By default,
+    # it will always be set to 127.0.0.1
+    host: "127.0.0.1"
+
+    # The port used for the Prometheus exporter. By default,
+    # it will always be set to 8555
+    port: 8555
+
 # The PostgreSQL connection URI that is used to connect to the database
 # The URI must be valid, and components will need to be quoted.
 # See https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING