telegraf/plugins/inputs/postgresql_extensible/README.md

PostgreSQL plugin

This postgresql plugin provides metrics for your postgres database. It has been designed to parse ithe sql queries in the plugin section of your telegraf.conf.

For now only two queries are specified and it's up to you to add more; some per query parameters have been added :

• The SQl query itself

• The minimum version supported (here in numeric display visible in pg_settings)

• A boolean to define if the query have to be run against some specific variables (defined in the databaes variable of the plugin section)

• The list of the column that have to be defined has tags

  specify address via a url matching:

  postgres://[pqgotest[:password]]@localhost[/dbname]?sslmode=[disable|verify-ca|verify-full]

  or a simple string:

  host=localhost user=pqotest password=... sslmode=... dbname=app_production

  All connection parameters are optional.

  Without the dbname parameter, the driver will default to a database

  with the same name as the user. This dbname is just for instantiating a

  connection with the server and doesn't restrict the databases we are trying

  to grab metrics for.

  address = "host=localhost user=postgres sslmode=disable"

  A list of databases to pull metrics about. If not specified, metrics for all

  databases are gathered.

  databases = ["app_production", "testing"]

  Define the toml config where the sql queries are stored

  New queries can be added, if the withdbname is set to true and there is no databases defined

  in the 'databases field', the sql query is ended by a 'is not null' in order to make the query

  succeed.

  Be careful that the sqlquery must contain the where clause with a part of the filtering, the plugin will

  add a 'IN (dbname list)' clause if the withdbname is set to true

  the tagvalue field is used to define custom tags (separated by comas)

  Structure :

  inputs.postgresql_extensible.query

  sqlquery string

  version string

  withdbname boolean

  tagvalue string (coma separated)

  inputs.postgresql_extensible.query sqlquery="SELECT * FROM pg_stat_database where datname" version=901 withdbname=false tagvalue="" inputs.postgresql_extensible.query sqlquery="SELECT * FROM pg_stat_bgwriter" version=901 withdbname=false tagvalue=""

The system can be easily extended using homemade metrics collection tools or using postgreql extensions (pg_stat_statement, pg_proctab, powa...)