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Add documentation for auto-discover-databases

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Arno Geurts 2019-04-16 12:03:52 +02:00 committed by Will Rouesnel
parent 58043f72da
commit 4d96104c10
2 changed files with 6 additions and 1 deletions
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5
README.md
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@ -161,6 +161,11 @@ or a variant of postgres (e.g. Greenplum) you can disable the default metrics wi
flag. This removes all built-in metrics, and uses only metrics defined by queries in the `queries.yaml` file you supply
(so you must supply one, otherwise the exporter will return nothing but internal statuses and not your database).
### Automatically discover databases
To scrape metrics from all databases on a database server, the database DSN's can be dynamically discovered via the
`--auto-discover-databases` flag. When true, `SELECT datname FROM pg_database` is run for all configured DSN's. From the
result a new set of DSN's is created for which the metrics are scraped.
### Running as non-superuser
To be able to collect metrics from `pg_stat_activity` and `pg_stat_replication`

2
cmd/postgres_exporter/postgres_exporter.go
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@ -1064,7 +1064,7 @@ func newDesc(subsystem, name, help string, labels prometheus.Labels) *prometheus
}
func queryDatabases(server *Server) ([]string, error) {
rows, err := server.db.Query("SELECT datname FROM pg_database;") // nolint: safesql
rows, err := server.db.Query("SELECT datname FROM pg_database") // nolint: safesql
if err != nil {
return nil, fmt.Errorf("Error retrieving databases: %v", err)
}