enhancement: support http SD in scrapeconfigs

[QuentinBisson]

PR Description

This pull request adds support for HTTP service discovery to the prometheus.operator.scrapeconfigs component, allowing users to specify httpSDConfigs in ScrapeConfig CRDs.

Which issue(s) this PR fixes

Notes to the Reviewer

PR Checklist

• CHANGELOG.md updated
• Documentation added
• Tests updated
• Config converters updated

[kalleep]

Hey, could you give some more context for this feature? Any documentation on how this works with the operator?

[QuentinBisson]

Of course. So basically, the prometheus operator scrape configs now support 21 différent discovery mechanisms. The main ones are documented here: https://prometheus-operator.dev/docs/developer/scrapeconfig/#use-scrapeconfig-to-scrape-an-external-target

This allows the operator to discover non static targets via différent protocols and I need the http service discovery support :D

[clayton-cornell]

Don't we need a doc update in prometheus.operator.scrapeconfigs for this change?

I'm guessing we should add something like this:

ScrapeConfig resources support multiple service discovery methods including static configurations and HTTP service discovery for dynamic target discovery.

As well as something describing the HTTP service discovery, and extend or add to the examples... (with a YML scrape config and the JSON return)?

[QuentinBisson]

@clayton-cornell what do you think about this documentation update?