Go implementation with OCI Vault support (#21)

* add list of default metrics in readme

* readme updates

* various updates

* README.md updates

* README.md updates

* basic example

* adds... 1. ability to specify DATA_SOURCE_USER, DATA_SOURCE_PASSWORD, and DATA_SOURCE_SERVICENAME individually rather than as one DATA_SOURCE_NAME entry (thus more secure) 2. multi-database support via "/scrape" endpoint with "target" param taking dns for specific database (this will soon be enhanced so that it is instead configurable, again to be more secure) . Also, updated POM entries for 21.7 version.

* adds multi-datasource support based on configuration which includes OCI Vault support and various fixes.

* adds multi-datasource support based on configuration which includes OCI Vault support and various fixes.

* Go implementation with OCI Vault support

Author: paulparkinson

.gitignore

@@ -0,0 +1,26 @@
+#
+# Makefile Version 1.0
+#
+# Copyright (c) 2021 Oracle and/or its affiliates.
+# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl/
+#
+#
+
+
+deploy:
+	docker stack deploy --compose-file docker-compose.yml oracledb-monitor
+
+down:
+	docker stack rm oracledb-monitor
+
+log-oracledb:
+	docker service logs --follow oracledb-monitor_oracledb --raw
+
+log-exporter:
+	docker service logs --follow oracledb-monitor_exporter --raw
+
+# pause:
+# 	docker-compose pause
+#
+# unpause:
+# 	docker-compose unpause