Added postgres defaults file

prometheus/files/default-postgres_exporter.jinja

@@ -0,0 +1,21 @@
+# Set the command-line arguments to pass to the postgres_exporter service.
+ARGS=""
+
+# postgres exporter supports the following options:
+#   -web.listen-address
+#   -web.telemetry-path
+#
+# postgres exporter supports the following environment variables:
+#   DATA_SOURCE_NAME
+#   DATA_SOURCE_URI
+#   DATA_SOURCE_USER
+#   DATA_SOURCE_USER_FILE
+#   DATA_SOURCE_PASS
+#   DATA_SOURCE_PASS_FILE
+#   PG_EXPORTER_WEB_LISTEN_ADDRESS
+#   PG_EXPORTER_WEB_TELEMETRY_PATH
+#   PG_EXPORTER_DISABLE_DEFAULT_METRICS
+#   PG_EXPORTER_DISABLE_SETTINGS_METRICS
+#   PG_EXPORTER_EXTEND_QUERY_PATH
+#   PG_EXPORTER_CONSTANT_LABELS
+