Add `params` to scrape job configuration

[gboutry]

Enhancement Proposal

It is possible, in prometheus configuration to add the parameter params to a job, to specify HTTP query parameters to add to the metrics_path (? gets HTML encoded if provided in the metrics path).

https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config

My use case: I'm using openstack-exporter that exposes the following endpoints:

• /metrics <-- exposes the exporter's internal metrics
• /probe?cloud=<name of cloud> <-- exposes cloud's metrics

Params schema:

params: dict[str, list[str]]