Update README.md (#2719)
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# PostgreSQL plugin
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This postgresql plugin provides metrics for your postgres database. It has been
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designed to parse ithe sql queries in the plugin section of your telegraf.conf.
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designed to parse SQL queries in the plugin section of your `telegraf.conf`.
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For now only two queries are specified and it's up to you to add more; some per
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query parameters have been added :
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The example below has two queries are specified, with the following parameters:
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* The SQl query itself
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* The minimum version supported (here in numeric display visible in pg_settings)
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* A boolean to define if the query have to be run against some specific
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* variables (defined in the databaes variable of the plugin section)
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* The list of the column that have to be defined has tags
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* The SQL query itself
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* The minimum PostgreSQL version supported (the numeric display visible in pg_settings)
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* A boolean to define if the query has to be run against some specific database (defined in the `databases` variable of the plugin section)
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* The name of the measurement
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* A list of the columns to be defined as tags
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```
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[[inputs.postgresql_extensible]]
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# or a simple string:
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# host=localhost user=pqotest password=... sslmode=... dbname=app_production
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#
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# All connection parameters are optional. #
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# All connection parameters are optional.
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# Without the dbname parameter, the driver will default to a database
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# with the same name as the user. This dbname is just for instantiating a
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# connection with the server and doesn't restrict the databases we are trying
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```
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The system can be easily extended using homemade metrics collection tools or
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using postgreql extensions ([pg_stat_statements](http://www.postgresql.org/docs/current/static/pgstatstatements.html), [pg_proctab](https://github.com/markwkm/pg_proctab),[powa](http://dalibo.github.io/powa/)...)
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using postgreql extensions ([pg_stat_statements](http://www.postgresql.org/docs/current/static/pgstatstatements.html), [pg_proctab](https://github.com/markwkm/pg_proctab) or [powa](http://dalibo.github.io/powa/))
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# Sample Queries :
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- telegraf.conf postgresql_extensible queries (assuming that you have configured
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