support http header in input prometheus_scrape for bearer token

[helmut72]

Is your feature request related to a problem? Please describe.

For example Watchtower provides metrics through an enabled API. This API is ideally secured with a token:
https://containrrr.dev/watchtower/metrics/

Describe the solution you'd like

Support http headers in input prometheus_scrape for bearer tokens like it's possible for output prometheus_remote_write

[patrick-stephens]

I think there were some general HTTP header improvements in the works, I'm sure I saw an issue or PR somewhere...

It was discussed in a community meeting, @braydonk was it with you?

[helmut72]

Would be great.

[patrick-stephens]

This is now covered via #7785

[braydonk]

This wasn't me discussing it in the community meeting, but taking a look at the PR it looks good to me!

[helmut72]

This was fast, thank you!

[patrick-stephens]

Until a release is out, you can grab the test images/packages from the nightly builds to verify.

[helmut72]

Where can I find nightly docker images?

Nothing here:
https://hub.docker.com/r/fluent/fluent-bit/

There is no overview at cr.fluentbit.io/fluent/fluent-bit about the name of the nightly builds. I found cr.fluentbit.io here:
https://docs.fluentbit.io/manual/installation/docker

Also found something there:
https://github.com/fluent/fluent-bit/tree/master/dockerfiles:
But ghcr.io/fluent/fluent-bit/master ("images built on each push to master") is v1.9.4 ...

Thanks

[patrick-stephens]

https://github.com/fluent/fluent-bit/tree/master/.github/workflows#unstablenightly-builds

Images are available in ghcr.io and packages can be downloaded from the build jobs themselves: https://github.com/fluent/fluent-bit/actions/workflows/cron-unstable-build.yaml

[helmut72]

Thank you. I have tested with Watchtower and Gitea and it works 🎉

[patrick-stephens]

Great, might be worth adding an example to the docs just to show it explicitly if you have time.

[helmut72]

Here is an example, but it's not much different to current prometheus_scrape example:

[INPUT]
    name         prometheus_scrape
    tag          gitea
    host         172.17.1.1
    port         3000
    bearer_token verysecret

[OUTPUT]
    name  stdout
    match gitea