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The main task of pgexporter is to gather metrics from your database and format it according to Prometheus metrics standards. pgexporter provides some pre-defined metrics that are necessary/useful, and also provides the capability of providing custom metrics to the user.
pgexporter defines a lot of metrics out of the box. All of the internal metrics that are exported can be viewed here. By default, all of them are enabled, and will be reflected in the output. However, if you need only specific metrics, you can enable only them as shown here (and thus, disable other metrics).
See Custom Metrics.