feat(otelcol/exporter/splunkhec) Add Splunk HTTP Event Collector (HEC) Exporter

[adlotsof]

PR Description

Adds functionality described in #1645 and the proposal at #1646

Pinging @PatMis16

Which issue(s) this PR fixes

Fixes #1646

Notes to the Reviewer

PR Checklist

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

[CLAassistant]

All committers have signed the CLA.

[adlotsof]

I assume the failed ci is due to me forgetting to re-run go generate ./internal/tools/docs_generator/ after updating the docs?

[wildum]

Thanks for your contributions, it looks great already :)
The config converter is missing (this is used to convert an otel config to an alloy config automatically). Here is the converter folder: https://github.com/grafana/alloy/tree/main/internal/converter/internal/otelcolconvert and here is a PR that adds a new converter: https://github.com/grafana/alloy/pull/739/files
Else, are you ok to become a maintainer of this component? This would only involve keeping the component up to date with upstream and eventually we might ping you on github if there are issues related to the component. We update all otel dependencies every 6-7 weeks. It's ok to miss some updates but if at some point the component falls too far behind and there are breaking changes then we would need to disable it. You can step out from being a maintainer at any time

[wildum]

if you volunteer to maintain the component, you should put your @ here like in the datadog community component:
// Maintainers for the Grafana Alloy wrapper:
// - @adlotsof

[adlotsof]

Realistically, i will have to discuss at work (with @PatMis16) - I would love to have the time in my free time, but its just not the case at the moment. I will come back to you on the volunteering to be maintainer - question.

[wildum]

did you test the heartbeat functionality? is it working as expected?

[adlotsof]

Thanks for your contributions, it looks great already :)

Puh i pretty much just copied (or tried to copy) what was done in the datadog PR . I will address your comments as soon as i manage to also work on them. Thanks a lot for the kind words!

The config converter is missing (this is used to convert an otel config to an alloy config automatically). Here is the converter folder: https://github.com/grafana/alloy/tree/main/internal/converter/internal/otelcolconvert and here is a PR that adds a new converter: https://github.com/grafana/alloy/pull/739/files

I dont know how i missed this - but i will add the converter when addressing the remaining, open comments.

Else, are you ok to become a maintainer of this component?

I will come back to you on this

[adlotsof]

@wildum i believe i have addressed all your comments

[clayton-cornell]

Some additional doc suggestions

[wildum]

Awesome work! I resolved the comments that were addressed, there are only a few left but we are very close to get it merged.
We still need to find a maintainer though