Hacking on pg-exporter

adding a new scraper

define your model in collector/models

Models are defined by creating a struct like in the most ORM's. As pg-exporter uses bun, the same bun tags are used.

In addition, the following pg-exporter specific tags are available and required for code-generation:

help: defines the help text for the metric
metric: defines metric name and type. The first, optional paramter is the name. Type could be:
- counter: for counter values
- gauge: for gauge values
- label: fo labels

generate the full code for the model

run go generate . in the root folder of the project

define the scraper

create a new, empty, struct in the collector package, that implements the Scraper interface.
Inside the Scrape function, fetch your data from the database with the given database connection.
- see bun for details how to do that
use the (generated) function ToMetrics on your result to provide the metrics to the prometheus handler