PostgresSQL Server Exporter

Prometheus exporter for PostgresSQL server metrics. Supported Postgres versions: 9.1 and up.

Building and running

make
export DATA_SOURCE_NAME="login:password@(hostname:port)/dbname"
./postgres_exporter <flags>

Flags

Name	Description
web.listen-address	Address to listen on for web interface and telemetry.
web.telemetry-path	Path under which to expose metrics.

Setting the Postgres server's data source name

The PostgresSQL server's data source name must be set via the DATA_SOURCE_NAME environment variable. The format of this variable is described at https://github.com/go-sql-driver/mysql#dsn-data-source-name.

Adding new metrics

The exporter will attempt to dynamically export additional metrics if they are added in the future, but they will be marked as "untyped". Additional metric maps can be easily created from Postgres documentation by copying the tables and using the following Python snippet:

x = """tab separated raw text of a documentation table"""
for l in StringIO(x):
    column, ctype, description = l.split('\t')
    print """"{0}" : {{ prometheus.CounterValue, prometheus.NewDesc("pg_stat_database_{0}", "{2}", nil, nil) }}, """.format(column.strip(), ctype, description.strip())

Adjust the value of the resultant prometheus value type appropriately. This helps build rich self-documenting metrics for the exporter.