Initial commit with PostgreSQL and MySQL/MariaDB templates.

templates/postgresql/README.md

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+# PostgreSQL
+
+This directory contains a very comprehensive template which will monitor PostgreSQL server and databases for you. All available parameters are set.
+
+## Prerequisites
+
+You should have nxagent [configured to use one or more PostgreSQL server](https://www.netxms.org/documentation/adminguide/database-monitoring.html#postgresql).
+
+## No thresholds
+
+This template contains no thresholds, feel free to modify it locally according to your needs.