0d27e58e78
Added more explanation on the plugin and change the « withdbname » boolean to false to be sure that by default it will work if the database is not set |
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| .. | ||
| README.md | ||
| postgresql_extensible.go | ||
| postgresql_extensible_test.go | ||
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 :
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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...)